If a two-digit number is between 30 and 40. The ones digit is three times the tens digit. What is the number?

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Solution

The correct option is D 39
The number is between 30 and 40. Between that, all the numbers starts with 3. Also, the ones digits is three times the tens digit.
Ones digit = tens digit $\times$ 3
= 9

$∴$ The number is 39.

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If a two-digit number is between 30 and 40. The ones digit is three times the tens digit. What is the number?

The correct option is D 39The number is between 30 and 40. Between that, all the numbers starts with 3. Also, the ones digits is three times the tens digit. Ones digit = tens digit × 3 = 9 ∴ The number is 39.

The correct option is D 39
The number is between 30 and 40. Between that, all the numbers starts with 3. Also, the ones digits is three times the tens digit.
Ones digit = tens digit $\times$ 3
= 9

$∴$ The number is 39.