The product of three natural numbers is 84, and the sum of two numbers is exactly equal to the third number

The product of three natural numbers is 84, and the sum of two numbers is exactly equal to the third number

84 = 2 × 2 × 3 × 7 = 3 × 4 × 7, because 3 + 4 = 7, so the three numbers are 3, 4 and 7 respectively