To make an international telephone call, you need the code for the country you are calling. The code

To make an international telephone call, you need the code for the country you are calling. The code for country A, country B, and C are three consecutive integers whose sum is 90. Find the code for each country.

If they are three consecutive integers, then we have:

1. B = A + 1
2. C = B + 1, which means C = A + 2
3. A + B + C = 90

Substitute (1) and (2) into (3)
A + (A + 1) + (A + 2) = 90

Combine like terms
3A + 3 = 90

Using our equation calculator, we get:
A = 29

Which means:

• B = A + 1
• B = 29 + 1
• B = 30
• C = A + 2
• C = 29 + 2
• C = 31

So we have (A, B, C) = (29, 30, 31)