Предмет: Математика, автор: lanakireeva19

В 20% раствор пищевой соды массой 420 гр добавили 10% раствор пищевой соды массой 180 гр.Какова концентрация пищевой соды в смеси?

Ответы

Автор ответа: denis12z

8

1) 420*20:100=84(г)-масса соды первого раствора
2) 180*10:100=18(г)-масса соды второго раствора
3) 420+180=600 (г)-масса смеси
4) 84+18=102(г)-масса соды
5) 600:100=6(г)-в 1%
6) 102:6=17(%)-концентрация пищевой соды
Ответ:17% концентрация пищевой соды в смеси

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Русский язык, автор: opatyt

снежинки медленно опускаются собираются хлопьями и падают на землю. синтаксический разбор.(повест.,.... )пжж

1 год назад

Предмет: Английский язык, автор: 1КрохА

1) Bob ____ football on Mondays.
is playing
play
plays
has played
2) Mary and John _______ film now.
watched
are watching
watch
were watching
3) This actor hasn’t got _______ awards.
no
some
much
any
4) “____ I meet Frank at the station?” “- No, Mary will give him a lift.”
Would
Am
Can
Shall
5) I’d like a ______ of Cola, please.
carton
packet
cup
can
6) This sportsman is ______ than that one.
not as fast
faster
the fastest
as fast
7) There are red skies behind the door. ______ skies belong to Mary.
Any
The
A
Some
8) ______ enter this door. It’s for staff only.
Can’t
Didn’t
Don't
Shouldn't
9) There ____ two runners-up in yesterday competition.
are
was
did
were
10) When you give somebody something, for example, a ticket, you say: “_________”
Please.
Not at all.
Thanks.
Here you are.
11) ____ you come to stadium tomorrow?
Have
Will
Did
Do
12) That runner is still the first. He _______ .
is winning
win
is going to win
was winnning
13) I was asleep when Bob ____.
is ringing
rang
rings
has rung
14) Have you seen the uniform? What is it ________?
like
nice
look
good
15) Excuse me, how can I ________ to the stadium?
find
reach
get
come
16) If you call me in advance, I _______ it for you.
will book
book
would book
has booked
17) He is _____ player in the team.
more famous
the more famous
the most famous
the famous
18) When someone thanks you, you won’t say: “___________”
Please.
Don’t mention it.
Not at all.
You are welcome.
19) _____________ to Siberia?
Have you ever been
Were you ever
Are you ever
Did you ever be
20) This project __________ by Dan.
is done
has done
did
be done
21) It was ______ an adventurous journey that I will always remember it.
too
such
so
very
22) I ___________ the dishes when the electricity was cut off.
have washed
have been washing
was washing
washed
23) If you can’t do it by yourself ask him ____ help.
on
for
about
-
24) You ____ wear the uniform. That is a rule.
need
could
must
can
25) You don’t speak French, ______ ?
isn’t it
are you
do you
don’t you
26) “I don’t smoke.” “_________”
Neither do I.
Neither don’t I.
So do I.
So don’t I.
27) I ___________ to Moscow next week.
am going
go
went
shall go
28) ______ can’t do it well.
Somebody
Something
Anybody
Nobody
29) If you ______ , you would have known about it.
had come
have come
came
come
30) How long ________________ English?
did you learn
are you learning
have you been learning
do you learn
31) He stopped ______ and answer the phone.
to sing
singing
sing
sang
32) You are not __________ to apply for this job.
old enough
enough old
too old
too much old
33) Put down my phone number in case you _________ any questions.
have
will have
had
would have
34) I was really surprised when I came ____ my old diary.
across
through
in
into
35) ____________ it was a real challenge, we did it.
Moreover
If
Although
So
36) Has he ever _______ to London?
Введите ответ
37) Will you pay by credit card or in ________?
Введите ответ
38) Never _____ , I’ll manage.
Введите ответ
39) In the future people will be _____ to speak any language fluently.
Введите ответ
40) I’ve got a job ________ from their company.
Введите ответ
41) If I had spoken to him, I ________ that mistake.
Введите ответ
42) ____________ to the survey, people prefer staying at home when it rains.
Введите ответ
43) This job is not as well-paid _________ that one.
Введите ответ
44) I don’t like tennis. It’s not my cup of _______ .
Введите ответ
45) If you want to join, please fill ____ an application form.
Введите ответ
46) Hold ___ for a minute, Mr Black is on the other line.
Введите ответ
47) Although she lives so far now, we still keep in _____ .
Введите ответ
48) I wish I _______ play the trumpet but I can’t.
Введите ответ
49) If you don’t complete a report tonight, we won’t _______ the deadline.
Введите ответ
50) By and _____ he is a calm person but that time he lost his temper.
Введите ответ
51) “Bob was jailed again!” “He’s got very respectable parents. Indeed, every family has a black ______ ”.
Введите ответ
52) I haven’t seen my uncle Bob ____ I was a child.
Введите ответ
53) I ________ to do yoga in the morning, but I have no time for it now.
Введите ответ
54) Unless you buy a new torch, the old one can also come in ____ .
Введите ответ
55) We _______ out of petrol and got stuck on the highway at the middle of the night.
Введите ответ

1 год назад

Предмет: Английский язык, автор: karpenkovdima45

Write these sentences in the reported speech.
1. Bob said: "I don't like fish".
2. Gregory said: "We can't ski, Oleg".
3. The Browns said: We won't go to Australia".
5. Hugo said: "I have visited several foreign countries this year".
6. Julia asked: "Did you expect such results, Sam?"
7. Sarah said: " A lot of cottages are damaged after the storm".
8. The weatherman said: "Sundays' weater will become worse".
9. Polly said: " Bring the plates from the kitchen, please".
10. Granny said: " Don't hurt yourself, Robert".

1 год назад

Предмет: Математика, автор: tankozmavile

Найдите решение уравнения 4sinx=5-4cos^2 x

7 лет назад

Предмет: Химия, автор: guly01

Определите массу соли образуется при взаимодействии 24 г уксусной кислоты с 28 Г гидроксида калия

7 лет назад