Gnpth wrote:

What is the smallest integer that is the sum of 2 distinct prime integers, each greater than 80 ?

A. 170

B. 172

C. 173

D. 199

E. 186

the fastest way to identify prime numbers that are less than 100, is to divide by the first prime numbers: 2, 3, 5, 7. If the number is not divisible by these prime numbers, then the number is a prime one.

81 - not prime, divisible by 3

82 - not prime, divisible by 2

83 - is a prime number

84 - not prime, divisible by 2

85 - not prime, divisible by 5

86 - not prime, divisible by 2

87 - not prime, divisible by 3

88 - not prime, divisible by 2

89 - is a prime number

89+83 = XX2. units digit is 2. Only B has the units digit 2. B must be the answer.