diagram is 30cm long, reduce to 20cm long. if the width was 18cm wide, wat is the reduce width.

Question

Diagram is 30cm long, reduce to 20cm long. If the width was 18cm, wat is the reduce width.

Answer 1

Think of this as a ratio problem:

20/30 = x/18

2/3 = x/18

2*18 / 3 = x

2 * 6 = x

12 = x

 

So the reduced width is 12 cm long.

Answer 2

Set up a proportion.

 

Ratio of original measurements = ratio of reduced measurements.

 

(30 / 18) = (20 / x)

 

 

Cross multiply.

 

30x = 18 * 20

30x = 360

    x = 12

 

The reduced width is 12cm.