Practice Test Discussion

In a two digit number, the digit in ten's place is four times the digit in Unit place and sum of the digits is equal to ten . What is the number ?

[LIC Assistant Administrative Officer (AAO), 2005]

Data inadequate

None of the above

Explanation

Let the number in unit's place be x

Then digit at tens place will be 4x

∴ 10×4x++x ---Eq(1)

According to the question

It given that x+4x=10

⇒ 5x=10

⇒x=2

subtitute 'x'in Eq(1) we get

⇒10×4×2+2

⇒ 82

Hence Option C is correct.

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