Question

Aflati 20% dintr-un numar stiind ca 70% din el este 75. Urgent!!!!!!!!!!!!!!!

Answer 1

70/100 ·x=75
⇒x=75/70/100
⇒x=75·100/70
⇒x=75·10/7
⇒x=750/7⇒x=107,142857142;
⇒20/100 ·107,142857142
⇒20·107,142857142/100
⇒107,142857142/5
⇒21,4285714284;