Question

In a two digit number the units digit is 4 times the tens digit and the sum of the digits is 10.find the number.

Answer 1

Answer:

"28

Step-by-step explanation:

Let the tens digit be x.Then , the units digit = 4x

therefore, x + 4x = 10

= 5x = 10

= x = 10/5 = 2

hence, the tens digit = x = 2

and unit digits = 4x = 4 × 2 = 8

hence, the required number is (10 × 2 + 8) = 28"

Answer 2

Answer:

Let the tens digit be x and units digit be y

therefore the digit is xy

Unit digit is 4 times the tens digit

therefore y = 4x

4x - y = 0

The sum of both the digits is 10

Hence x + y = 10

Calculating (Adding) both the equations

5x = 10

x = 2

Solving the above (any one) equation, we get

y = 8

therefore the number is 28.