Question

a:b =5:3 find 5a + 8b:7a-8b

Answer 1

a:b = 5:3

Put values in

5a+8b/ 7a-8b

( 5×5 + 8×3) / (7×5 - 8 × 3)

(25+24)/(35 - 24)

49/11

Hence ratio is 49 : 11


Thanks

Answer 2

Let
A=5x
B=3x

5a + 8b:7a-8b

5(5x) + 8(3x)/7(5x)-8b(3x)
25x+24x/35x-24x
49x/11x


49:11

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