Question

Question #ade40

Answer 1

(a) `10a+b=5(a+b)`

(b) `10a+b=(10b+a)-9`

Simplifying:

(a) 5a=4b

(b) 9a=9b-9

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(a) 5a=4b

(b) a=b-1

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(a) 5a=4b
(b) 5a=5b-5

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`0=b-5=>b=5`
a=4

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The number is 45.