How do you work this out 150/20 * 1/X = 3200?

X * 150/20*1/X = 3200 * X ====>
150/20 = 7.5 = 3200X ====>
7.5/3200 = 3200/3200 X ====>
7.5/3200 = X

150/20 * 1/x = 3200
first you're going to take 150*1 and 20*x that's equal 150/20x = 3200
After that you do cross multiplication 3200 * 20x = 150, now you're going to have 64000x =150
Then, you're take 150/64000 = 0.002344

150/20 * 1/X = 3200
Multiplication of fractions.
150 / 20x = 3200
Invert
20x/150 = 1/3200
2x/15 = 1/3200
Divide through by '2'
x/15 = 1/6400
Multiply through by '15'
x = 15/6400
Caancel down
x = 3 / 1280
Finally,
Divide 3 by 1280
1280 ) 3.0000000000(0.00234375

150/20 * 1/X = 3200
150/20x = 3200
150 = 64000x
x = 150/64000 = 0.002344

Use cross multiply,
150/20 * 1/X = 3200
150/20x=3200
150=3200*20x
150 = 64000x
x =150/64000 =0.002344
sorry, i am so careless