Question

a number between 10 and 100 is 5 times the sum of its digits if 9 be added to it the digits are reversed find the number​

Answer 1

Answer:

Number is 45

Step-by-step explanation:

let the no. be 10x+y

sum of it's digits = x+y

according to the question:

$5 \times (x + y) = 10x + y \: \: equation \: 1 \\ 9 +( 10x + y) = 10y + x \: \: equation \: 2 \\ \\ solve \: equation \: 1 \: and \: 2$

x=4

y=5

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