Question

a two-digit number contains the smaller one of the two digits in the unit's place. the product of the digit's is 40 & the difference between the digits is 3. find the number.

Answer 1

ab is the number

b=3a

ab means 10a+b

10a+b+36=10b+a  (the digits interchange their places)

substitute 3a for b

10a+3a+36=10(3a)+a

10a+3a+36=30a+a

13a+36=31a

36=31a-13a

36=18a

a=36/18

a=2

b=3*2=6

the number is 26

check: 26+36=62