Question

A number consists of two digits.The digit in the unit place is the square of the digit in the ten's place. If the sum of digits is 12, find the number.​

Answer 1

Answer:

Let the digit in the units place =x

Let the digit in the tens place =x+4

∴ The number is 10(x+4)+x=10x+40+x=11x+40

Sum of the digits =x+x+4=2x+4

Given, 2x+4=

7

1

(11x+40)

⇒14x+28=11x+40

⇒3x=12

⇒x=4

∴ the number is 11×4+40=44+40=84.