Question

If a : b = 3 : 4 then (7a + 3b) : (7a - 3b)

Answer 1

Answer:

Let, a/b=3/5=k

that means, a=3k and b = 5k

now,

7a+3b/7a-3b

=21k+15k/21k-15k

=36k/6k

=6

Step-by-step explanation:

hope this helps you

Answer 2

$\red{Answer:}$

let the common multiple be x

a=3x

b=4x

7a+3b=21x+12x=33x

7a-3b=21x-12x=9x

ratio = 33x/9x = 33/9.

hope it helps.

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