Question

(30:5)-a=12:4; (28:4)+a=40:5;(45:5):a=6:2; (2×8:4)+a=20:5; (6×5:3)+a=50:5; (9×2:3)-a=10:5;

Answer 1

1) 6-a=3 →
a=6-3=3
2) 7+a=8→
a=8-7=1
3) 9:a=3 →
a=9:3=3
4) 4+a=4 →
a=4-4=0
5) (30:3)+a=10 →
10+a=10 →
a=10-10=0
6) (18:3)-a=2→
6-a=2 →
a=6-2=4

Answer 2

(30:5)-a=12:4
6-a=3
a=6-3
a=3
(28:4)+a=40:5
7+a=8
a=8-7
a=1
(45:5):a=6:2
9:a=3
a=9:3
a=3
(2x8:4)+a=20:5
4+a=4
a=4-4
a=0
(6x5:3)+a=50:5
10+a=10
a=10-10
a=0
(9x2:3)-a=10:5
6-a=2
a=6-2
a=4