Question

the sum of a digit of a 2 digit no. is 8.If the digits are reversed , the new no. is increased by 18. Find the new no. please answer fast and correctly.. tomorrow is my exam...

Answer 1

done..........................

Answer 2

let the tens digit be x and units digit be y

also, 10x + y = Original Number

x + y = 8-----i

if the digits are reversed
then, tens digit = y
units digit = x

then, 10y + x + 18 = 10x + y
=> 9x-9y= 18
=>x-y = 2-----ii

adding i and ii

2x = 10
=> x = 5
y = 3
therefore, the number is 35