SajjadAhmad
Source: Nova GMAT
x, y, and z are numbers that have a sum of 93. Find the numbers.
1. The numbers are primes.
2. The numbers are consecutive integers.
The key things to look for in the stimulus and in the statements are - do the numbers have to be integers? Do the numbers have to be positive?
Statement 1
Three prime numbers must add up to 93; however, the numbers are not restricted to being all positive or all negative. Also, the numbers are not restricted to a particular range ( example: prime numbers 1-100) Therefore, there may be more than one combination of prime numbers that add up to 93. Prime numbers 1-100
2 3 5 7 11 13 17 23
29 31 37 41 43 47 53 59
61 67 71 73 79 83 89 97
17 + 27 + 29 = 93
Yet-
97 + 3 + (-7) = 93
Insufficient
Statement 2
All three numbers are consecutive integers (are monotonically increasing; 1, 2 ,3 ; 7,8,9; 11,12,13 etc). The three numbers that add up to 93, therefore, cannot be negative because the sum would be negative. Additionally, there cannot be a mix of positive and negative numbers that are both large enough to add up 93 and consecutive. The three numbers must be 30 31 32
Sufficient