Question

Daca a-b=15 si a:b=4 dublul sumei celor doua numere este?

Answer 1

a-b=15 a/b=4 a=4b 4b-b=15 3b=15 b=5 a=4b=20 5+20=25•2=50

Answer 2

a-b=15         (a+b)x2= ?
a:b=4
a=bx4
bx4-b=15
3b=15
b=15:3
b=5
a=5x4
a=20
v: 20-5=15
    20:5= 4
(20+5)x2=25x2=50
r: 50