Question

i am a multiple of 7. i am also a multiple of 3. my ones digit is half my tens digit. what number am i ?

Answer 1

The number that is a multiple of 7 and 3, and where the ones digit is half the tens digit, is 42.

Step-by-step explanation:

The question states that we are looking for a number that is a multiple of 7 and a multiple of 3. Moreover, the number should have a ones digit that is half of its tens digit. We will explore the numbers that fit these criteria.

First, we need to find numbers that are multiples of both 7 and 3. The smallest common multiple of 7 and 3 is their least common multiple, which is 21. Consequently, the numbers we are considering would be multiples of 21, which are 21, 42, 63, 84, 105, and so on.

Next, we need to find a number among these multiples where the ones digit is half the tens digit. For example, the number 42 has a tens digit of 4 and a ones digit of 2, which satisfies the condition that the ones digit (2) is half the tens digit (4). Therefore, the number we are looking for is 42.

Answer 2

21 because 7x3 = 21 and 3x7 = 21