Question

A 2 digit no is 4 times the sum of the digit .It is also equal to 3 times the product of the digit .Find the no.

Answer 1

heya......


>> two digits, x & y

10x + y = the number

:>> A two digit number is 4 times the sum of its digits

10x + y = 4(x+y)

10x + y = 4x + 4y

10x - 4x = 4y - y

6x = 3y

>> divide both sides by 3

2x = y 

>> " and twice the product of its digit."

10x + y = 2xy

>> Replace y with 2x

10x + 2x = 2*x*2x

12x = 4x^2

>> Divide both sides by 4x

3 = x

then

y = 2(3)

y = 6

:>> the number = 36

:>> You can confirm this in both statement:

36 = 4(3+6)

and

36 = 2(3*6)


tysm....#gozmit