Thank you yahoo for making me understand about ratios please help me with this question.?

Question

is a:b=8:7 what is b if a is 24.a/b=8/7 now im stuck on written this out.please show me one more time.

Answer 1

a/b=8/7

24/b=8/7

b=24 (7/8)

b=21

Answer 2

so far you're right now just put 24 into your proportion for a

24/b=8/7 use cross products

24*7=8b

168=8b

so b would equal 21