Answer :
to get from a 24 to a 12, they divided by 2
so the other part of that ratio is 40/2= 20
12:20
to get from 40 to 80, they multiplied by 2
so the other part of the ratio is 24*2= 48
48:80
so the other part of that ratio is 40/2= 20
12:20
to get from 40 to 80, they multiplied by 2
so the other part of the ratio is 24*2= 48
48:80
