Luke can paint 91 portraits in 7 weeks.
how many portraits can luke paint in 4weeks?

First you have to find out how many he paints in 1 week.

Divide 91/7

You should then have 13 as your answer.

Then do 13 times 4 which would equal 52.

4 weeks = 52 portraits

If you want to see if it is right you can add 13 from 52 and once your at 7 you'll have 91.

Hope this helps! :)

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: