Exercise 1 - Equations with unknown numbers

The sum of three natural numbers is 638. The sum of the first two numbers is 377, and the third number is 96 larger than the second. What is the value of the first number.

Fill in here

Exemple !

The sum of three natural numbers is 610. The sum of the first two numbers is 392, and the third number is 57 larger than the second. What is the value of the first number.

a + b + c = 610

a + b = 392

b + 57 = c


392 + c = 610

c = 610 - 392 = 218


b + 57 = 218

b = 218 - 57 = 161


a + 161 = 392

a = 392 - 161 = 231


231 + 161 + 218 = 610


a = 231

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