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In a two-digit number the sum of the digits is 12, and the tens digit is twice the units digit. What is the number?

Competition practiceNumber System, HCF & LCM

A39
B84
C48
D93

Step-by-Step Solution

Let units =

u

and tens =

2 u

. Then

2 u + u = 12

gives

u = 4

and tens = 8, so the number is 84.

Answer: B) 84

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