1) 3/4-1/4=2/4=1/2
2)3/10-1/10=2/10=1/5
40/2=20 half is as many their is if she has lest of seven round to the highest num because they are all even numbers
First, you put the triangles in a ratio
Then, you ask yourself "what do I have to divide seven by to get 5" so you do 7.5/5 to get that answer (which is to divided by 1.5)
Then, on the other side, you divide 22.5 by 1.5 as well