The tens digit in a two-digit number is twice the unit’s digit. Which of the following is correct expression for the reversed number?
a. 21x
b. 10x+4
c. 20x+1
d. 12x
Answers
Given : The tens digit in a two-digit number is twice the unit’s digit.
To find : Which of the given is correct expression for the reversed number
Solution:
Let say two digit number = ab
Value of number = 10a + b
tens digit = a
unit digit = b
The tens digit in a two-digit number is twice the unit’s digit.
=> a = 2b
10(2b) + b = 21b ( is the number)
reverse of the number = ba
= 10b + a
= 10b + 2b
= 12b
Hence 12x is the right expression for the reversed number
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