Question

1. (1/2×n)-25=25×17
2. (1/5×n)-10=5×4
3. (10:1/2)×n=120

Answer 1

1. (1/2xn)-25 = 25x17
1/2n-25 = 425
1/2n = 425+25
1/2n = 450
n = 450 x 2/1
n = 900

2. (1/5xn)-10= 5x4
(1/5n) - 10 = 20
1/5n = 20 + 10
1/5n = 30
n = 30 x 5/1
n= 150

3. (10 : 1/2) x n = 120
(10 x 2/1) x n = 120
20 x n = 120
20n = 120
n = 6