Question

aflati numarul știind ca 40%din el reprezintă a)20% b)36% c)60% d)72%

Answer 1

40%a=20%
40a/100=20/100
40a=20
a=20/40=1/2

40%a=36%
40a/100=36/100
40a=36
a=36/40=9/10

40%a=60%
40a/100=60/100
40a=60
a=60/40=3/2

40%a=72%
40a/100=72/100
40a=72
a=72/40=9/5