The digit at the ones place of a three digit number is 1. The three digit number looks the same after reversing. If the digit at tens place is twice the number at ones place. What is the number?

151

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251

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121

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211

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Solution

The correct option is C 121
The number will look same after reversing, when the first and the last digit is same.
So the digit at ones place and hundreds place will be same
= 1
The digit at tens place
= 2 $\times$ digit at ones place
= 2 $\times$ 1
= 2
$∴$ The required number = 121

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The digit at the ones place of a three digit number is 1. The three digit number looks the same after reversing. If the digit at tens place is twice the number at ones place. What is the number?

The correct option is C 121 The number will look same after reversing, when the first and the last digit is same. So the digit at ones place and hundreds place will be same = 1 The digit at tens place = 2 × digit at ones place = 2 × 1 = 2 ∴ The required number = 121

The correct option is C 121
The number will look same after reversing, when the first and the last digit is same.
So the digit at ones place and hundreds place will be same
= 1
The digit at tens place
= 2 $\times$ digit at ones place
= 2 $\times$ 1
= 2
$∴$ The required number = 121