1) 8/20 = x/5x = (8 * 5) / 20x = 40 / 20x = 2
2) 9/x = 3/79 = 3x/73x = 63x = 63 / 3x = 21
3) x/16 = 3/4x = (3 * 16) / 4x = 48 / 4x = 12
4) 10/25 = 2/x2 = (10 * x) / 2550 = 10xx = 50 / 10x = 5
1) 8/20 = x/5
x = (8 * 5) / 20
x = 40 / 20
x = 2
2) 9/x = 3/7
9 = 3x/7
3x = 63
x = 63 / 3
x = 21
3) x/16 = 3/4
x = (3 * 16) / 4
x = 48 / 4
x = 12
4) 10/25 = 2/x
2 = (10 * x) / 25
50 = 10x
x = 50 / 10
x = 5