Question

Nekton is thinking of a prime number between 60 and 80; the tens digit is one less than the ones digit. What is the number?

a) 61
b) 71
c) 73
d) 79

Answer 1

The prime number between 60 and 80, where the tens digit is one less than the ones digit, is 71.

Step-by-step explanation:

The student is looking for a prime number between 60 and 80 where the tens digit is one less than the ones digit. To find the number, we can go through the options given and check if they satisfy the condition. Let's start with option a) 61. The tens digit is 6 and the ones digit is 1. Here, the tens digit is not one less than the ones digit, so 61 does not satisfy the condition. Now let's try option b) 71. The tens digit is 7 and the ones digit is 1. Since 7 is one less than 8, 71 satisfies the condition. Therefore, the number is 71 (option b).