Question

the unit digit in a two times the digit in tens place.if the digits are replaced with each other , the number becomes 18 nore than the first number . what is the first bumber.?

Answer 1

Heya!!!

GENERAL CONCEPT

Any two digit number ( suppose xy ) can be represent like this

10x + y



EXP:-


Let the digit at units place be x and let the digit at tens place be y

Let the two digit no. be xy


According to the question

y = 2x .... equation 1

10y + x = 10x + y + 18


y - x = 2..... equation 2



Now, put value of y in equation 2


2x - x = 2


x = 2 and y = 4


Hence the no. is 24



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