Question

Mihaela are 7 supra 10 din suma pe care o are Mihai. Ce suma are fiecare daca Mihaela are cu 30 de lei mai putin decat Mihai?

Answer 1

mihai are x
mihaela are 7/10*x
x-7/10*x=30
x(1-7/10)=30
x(10/10-7/10)=30
x*3/10=30
x*3=300
x=100- are Mihai
100*7/10=70- are Mihaela
100+70=170 - suma