Question

How do you solve `\frac { k } { 28} = \frac { 18} { 42}`?

Answer 1

`k/28=18/42`

Multiply both sides by `28`:
`k=frac{18*28}{42}`

To simplify, prime factorize the numbers and cancel:
`k=frac{3*color(red)(3*2*7)*2*2}{color(red)(7*3*2)}`

`k=12`