Question

Afla numarul necunoscut din egalitatea:
(25*a+250):(35:7)-25=75

Answer 1

(25xa+250):(35:7)-25=75
(25xa+250):5-25=75
(25xa+250):5=75+25=100
25xa+250=100x5=500
25xa=500-250=250
25xa=250
a=250:25
a=10