4. In a rectangle the ratio of length to width is
3:1. What is the width of the rectangle if
its length is 12 cm?

I NEED HELP NOW FAST PLEASE THE CORRECT ANSWER I AM ONLY IN FORM 1​

i need help please with my maths

Step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

21

step-by-step explanation: