Question

NEED ASAP!! Find the ratio a:b if it is given that..

1)
`(a)/(5)`=
`(b)/(7)`

2)2a=9b

3)6a-3b=5b

Answer 1

Answer: (1) 7:5 (2) 2:9 (3) 3:4

Explanation:

`(a)/(5) = (b)/(7)`

cross multiply to get: 7a = 5b

ratio = 7:5

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2a = 9b

ratio = 2:9

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6a - 3b = 5b

+3b +3b

6a = 8b

÷2 ÷2

3a = 4b

ratio = 3:4