A two digit no. Is 4 times the sum of its digits.How many such no. Are possible
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if we take the no. to be 10x + y then atq
10x + y = 4(x+y)
10x + y = 4x + 4y
10x- 4x= 4y- y
6x = 3y
y= 2x
by this equation we can have infinite no.s
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