Question

Solve the equation using number sense. I hope ya'll can understand this because i can't lol, thxs.

3d + 18 = 21
A: -1
B: 1
C: 3
D: 13

Answer 1

Answer: B: 1

Explanation:

Since we already know 3 + 18 = 21, then it would only make sense for 3 x 1 + 18 to equal 21. Even then, the other answers are incorrect by process of elimination