Grade 7 question:

I am a two-digit prime number
I am one less than a multiple of 10
If you add 30 to me you get another prime number

Who am I _________?

Thank You !

they all end in 9 and are all multiples of a number:P ahahaah

To find the two-digit prime number that satisfies these conditions, we can follow a step-by-step approach.

Step 1: Identify two-digit prime numbers
Start by listing down the two-digit prime numbers:
- 11
- 13
- 17
- 19
- 23
- 29
- 31
- 37
- 41
- 43
- 47
- 53
- 59
- 61
- 67
- 71
- 73
- 79
- 83
- 89
- 97

Step 2: Find a number which is one less than a multiple of 10
Look for a number in the list that is one less than a multiple of 10. This means it should end with 9.
- 19
- 29
- 59
- 79
- 89

Step 3: Add 30 to each number and check if the result is prime
Add 30 to each of the above numbers and check if the result is a prime number:
- 19 + 30 = 49 (not prime)
- 29 + 30 = 59 (prime)
- 59 + 30 = 89 (prime)
- 79 + 30 = 109 (prime)
- 89 + 30 = 119 (not prime)

Step 4: Identify the number that satisfies all conditions
From the above calculations, we can see that there are two numbers that satisfy all the given conditions. Those numbers are:
- 29 (one less than a multiple of 10, and if you add 30, you get another prime number - 59)
- 59 (one less than a multiple of 10, and if you add 30, you get another prime number - 89)

So, the answer to the question "Who am I?" could be either 29 or 59, as both of these two-digit prime numbers meet all the given conditions.

you can try 19, 29, 59, 79, 89. That will start you. On your own, figure out why I selected those.

umnfip fgbiyc nizkedq hrvpsx ipvkeonur apojvsx bchyned