Question

A number tripled is equal to 57. Let n be the number.

Which equation can be used to find the value of n and what is its solution?
A. n + 3 = 57; n = 54
B. n – 3 = 57; n = 60
C. = 57; n = 171
D. 3n = 57; n = 19

Answer 1

D. 3n = 57; n = 19

Explanation:

Answer 2

Another way of saying "a number tripled..." is "3 times a number...".  So 3xN, or 3n=57, then divide both sides by 3 and you get n=19.  Answer is D.