Question

Find the missing number         |key|x= the missing number

3/5=12/x        16/24=x/12        12/x=3/4      x/8=25/4       

x/42=1/6        12/x=2/9
 

Answer 1

3/5=12/x.

Cross multiply: 3x=60, x=20 or

12 is 4 times 3, so x is 4 times 5=20

16/24=x/12.

12 is half 24 so x is half 16=8

12/x=3/4.

3 is a quarter of 12, 4 is a quarter of 16, so x=16

x/8=25/4.

8 is twice 4 so x is twice 25=50

x/42=1/6.

6 times 7 is 42, 1 times 7 is 7 so x=7

12/x=2/9.

6 times 2 is 12, so 6 times 9 is 54, so x=54