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a two digit number is 4 times the sum of digits if is also equal to 3 times the product of digits find the number?
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ammu123454097:
24 is the answer
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Let the tens digit be x and the units digit be y
the two-digit number is (10x + y).
Two-digit number = 4 times sum of its digits
⇒10x + y = 4(x + y)
⇒ 10x + y = 4x + 4y
⇒ 6x = 3y
⇒ y = 2x
Two-digit number = three time the product of its digits
⇒ 10x + y = 3(xy)
⇒10x + y – 3xy = 0 … (2)
Substituting from equation (1) in equation (2), we get
⇒10x + y – 3xy = 0 … (2)
=> 10x + 2x -6x²
=> 6x ( 2- x ) = 0
so 2-x = 0 then x = 2
hence, y = 2x = 4
therefore number is 24
the two-digit number is (10x + y).
Two-digit number = 4 times sum of its digits
⇒10x + y = 4(x + y)
⇒ 10x + y = 4x + 4y
⇒ 6x = 3y
⇒ y = 2x
Two-digit number = three time the product of its digits
⇒ 10x + y = 3(xy)
⇒10x + y – 3xy = 0 … (2)
Substituting from equation (1) in equation (2), we get
⇒10x + y – 3xy = 0 … (2)
=> 10x + 2x -6x²
=> 6x ( 2- x ) = 0
so 2-x = 0 then x = 2
hence, y = 2x = 4
therefore number is 24
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