Question

4) (x + 57) : 7 = 12;
5) (161 - y): 16 = 9;
6) 112 : (17 + x) = 4.​

Answer 1

(x+57):7=12

х+57=12*7

х+57=84

х=84-57

х=27

(161-Y):16=9

161-y=9*16

161-y=144

161-144=y

y=17

112:(17+x)=4

112=68+4х

4х=44

х=11