A number consists of two digits. The digit in tens place exceeds the digit at units place by 4. The sum of the digit is 1/7 of the number. The number is
(a) 27
(b) 72
(c) 48
(d) 84
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let the no. be 10x+y
x = y+4
x - y = 4....................................1
x+y = 1/7×(10x+y)
x - 10x/7 + y - y/7 = 0
6y/7 = 3x/7
6y = 3x
2y = x
displace value of x in (1)
2y - y = 4
y = 4
x = 8
x = y+4
x - y = 4....................................1
x+y = 1/7×(10x+y)
x - 10x/7 + y - y/7 = 0
6y/7 = 3x/7
6y = 3x
2y = x
displace value of x in (1)
2y - y = 4
y = 4
x = 8
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