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

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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)