Question

Please help me solve this
A numbers ones digit is 2 more than twice its tens digit. The sum of its digits is 5. What's the number?

Answer 1

Let's say the number is ab, a is the tens digit and b is the ones digit.

2a+2=b and a+b=5
Substitute b
a+2a+2=5 3a+2=5
a=1
b=4

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