Question

Daca din 20 scad treimea unui numar obtin jumatatea lui.sa se afle numarul .dau coroana

Answer 1

20-1/3x=1/2x 20=1/2x+1/3x 20=5/6x x=20•6/5=24

Answer 2

20/1-a/3=a/2
120/6-2a/6=3a/6
120-2a=3a
120=2a+3a
120=5a
a=120:5
a=24