Numbers at ratio

The two numbers are in a ratio 3:2. If we each increase by 5 would be at a ratio of 4:3. What is the sum of original numbers?

Correct answer:

s =  25

Step-by-step explanation:

s = a+b

s = a+b

2a-3b = 0
3a-4b = 5
a+b-s = 0

a = 15
b = 10
s = 25

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