Tentukan nilai x? dari soal berikut

a. 12/√x = 6/2
12/√x = 3
12= 3√x
√x = 12/3
√x = 4
x = 16

b. 2√x /7 = 16/28
2√x /7 = 4/7
2√x = 4/7×7
2√x = 4
√x = 4/2
√x. = 2
x = 4