A number consists of two digits the digits at the tens place is twice that of the digit at unit place if 18 is subtracted from the number the digit reveresed.Find the number
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let the no. be 10x+y
and given that x = 2y…………………………1
10x+y - 18 = 10y + x
9x-9y = 18
x-y = 2..............………………2
displace the value of x from 1 to 2
2y-y = 2
y = 2
x = 4 hence the no. is 42
and given that x = 2y…………………………1
10x+y - 18 = 10y + x
9x-9y = 18
x-y = 2..............………………2
displace the value of x from 1 to 2
2y-y = 2
y = 2
x = 4 hence the no. is 42
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