Question

the ten digit of number is twice the unit digit . the number obtained by interchanging the digit is 36 less than the original number. find the original number

Answer 1

Orig number is 84 when interchanged is 48 and it is 36 less than the orig number.

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Answer 2

for linear equation in one variable let the number be xy
now x=2y

number=20y+y=21y

number formed on interchanging digit=2y y

: number=10y+2y=12y

a/q
=》21y-36=12y
=》21y-12y=36
=》9y=36
=》y=4
: number=20y+y=20×4+4=84