I am a two digit number less than 40. You say me when you count by fives .the Sumer of my digits is 7. What number am I?
10, 15, 20, 25, 30, 35
Which of those numbers has digits that add up to 7?
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To find the number you are, let's narrow down the possibilities step-by-step.
1. Start counting by fives: 5, 10, 15, 20, 25, 30, 35, 40.
2. Identify the two-digit numbers less than 40: 15, 20, 25, 30, 35.
3. Determine the sum of the digits for each number:
- For 15, the sum of the digits is 1 + 5 = 6.
- For 20, the sum of the digits is 2 + 0 = 2.
- For 25, the sum of the digits is 2 + 5 = 7.
- For 30, the sum of the digits is 3 + 0 = 3.
- For 35, the sum of the digits is 3 + 5 = 8.
4. Among these numbers, only one has a digit sum of 7, which is 25.
Therefore, the number you are is 25.
To find the number, we know that it is a two-digit number less than 40, and the sum of its digits is 7. We can start by listing all the possible numbers that meet these criteria.
The two-digit numbers less than 40 are: 10, 11, 12, ..., 39.
From this list, we need to find the numbers whose digits add up to 7. To do this, we can calculate the sum of the digits for each number and compare it to 7.
Let's go through the numbers one by one:
For 10, the sum of its digits is 1 + 0 = 1 (not 7).
For 11, the sum of its digits is 1 + 1 = 2 (not 7).
For 12, the sum of its digits is 1 + 2 = 3 (not 7).
...
For 35, the sum of its digits is 3 + 5 = 8 (not 7).
For 36, the sum of its digits is 3 + 6 = 9 (not 7).
For 37, the sum of its digits is 3 + 7 = 10 (not 7).
For 38, the sum of its digits is 3 + 8 = 11 (not 7).
For 39, the sum of its digits is 3 + 9 = 12 (not 7).
None of the numbers we listed have a digit sum of 7. Therefore, there is no two-digit number less than 40 whose digits add up to 7.