Question

40% от числа: 40,50,90,100,200,400

Answer 1

40-100%
x-40%
x=40*40/100=16


50-100%
x-40%
x=40*50/100=20

90-100%
x-40%
x=40*90/100=36

100-100%
x-40%
x=40*100/100=40


200-100%
x-40%
x=40*200/100=80

400-100%
x-40/0%
x=400*40/100=160

Answer 2

1)16
2)20
3)36
4)40
5)80
6)160