Question

Afla numarul a din fiecare egalitate:
(4+a):6=8

(a-5):5=7

80:(6+a)=10

Answer 1

4+a=6x8
4+a=48
a=48-4
a=44 ;

a-5=7x5
a-5=35
a=35+5
a=40 ;

6+a=10x80
6+a=800
a=800-6
a=794

Answer 2

4+a=48 a=44
a=40
a=(80-60):10=2