[poll id=”164″]
ANSWER
D. 71
This is a “puzzle-like” math problem that can be expected to be seen one or two times on the math OAT. Begin tackling these problems by first looking at the answer choices. One can eliminate ‘C’ immediately because it is not a prime number. From there, pick an answer choice and work from there. Because the question asks for the first number in the set of 3 prime numbers, it means you pick an answer choice, and then figure out the next two prime numbers that follow it. Add them up and see if they add up to 223. With 71, the next two prime numbers will be 73 and 79. 71+73+79=223.