Two numbers are such that the ratio between them is 4:5. If each is increased by 10, the ratio between the new numbers so formed is 13:15. Find the original numbers.
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Let the ratio be 4X and 5X
4X+10/5X+10 = 13/15
15(4X+10) = 13(5X+10)
60X + 150 = 65X+130
150-130 = 65X-60X
20 = 5X
X = 20÷5
=4
1st number = 16
2nd number = 20
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