Question

4. A number consists of two digits whose sum is
5. When the digits are reversed, the number
becomes greater by 9. Find the number.​

Answer 1

Answer:

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Let the number be 10t+u where t is the tens and u is the units digit.

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Equations:

t + u = 5

10u+t = 10t+u +9

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Simplify :

t + u = 5

9u - 9t = 9

t + u = 5

-t+u = 9

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Add:

2u = 14

u = 7

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But, if u = 7, then t= -2

HOPE THIS HELPS YOU!!!