1) 0.25 / 1.4 = 0.75 / xx = 1.4 * 0.75 / 0.25x = 4.2
2) 4 / 8 = 18 / xx = 8 * 18 / 4x = 36
3) x / (4 + 1/3) = 1/2 / 13x / (13/3) = 1/26x = 13/3 * 1/26x = 13/78
4) x / 16 = 0.2 / 4x = 16 * 0.2 / 4x = 0.8
1) 0.25 / 1.4 = 0.75 / x
x = 1.4 * 0.75 / 0.25
x = 4.2
2) 4 / 8 = 18 / x
x = 8 * 18 / 4
x = 36
3) x / (4 + 1/3) = 1/2 / 13
x / (13/3) = 1/26
x = 13/3 * 1/26
x = 13/78
4) x / 16 = 0.2 / 4
x = 16 * 0.2 / 4
x = 0.8