Question

If (5a + 2b) : (7a + 3b) = 9:13 find the value of a:b

Answer 1

Answer:

(5a+2b)/(7a+3b)=9/13

5a+2b=9. ---(1)

7a+3b=13. ---(2)

eqn (1) is multiply 3 - eqn (2) is multiply 2

15a+6b=27

(-)14a+6b=26

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a=1

a value sub in eqn (1)

5(1)+2b=9

2b=9-5

2b=4

b=2

Answer 2

Answer:

the ratio must be 1:2 mate