Find a two-digit number such that three times the tens digit is 2 less than twice the units digit, and twice the number is 20 greater than the number obtained by reversing the digits.
A. 24 B. 42 C. 74 D. 47 E. 72
Correct Answer: D
Explanation
Let the two-digit number be represented as \( 10t + u \), where \( t \) is the tens digit and \( u \) is the units digit.
We are given two conditions:
1. Three times the tens digit is 2 less than twice the units digit. \[ 3t = 2u - 2 \tag{1} \]
2. Twice the number is 20 greater than the number obtained by reversing the digits. \[ 2(10t + u) = 20 + (10u + t) \tag{2} \]