Hi Daniel,
To solve this problem, we must translate the givens into an equation:
Step One: Remember that "plus" means add while "times" means multiply
Step Two: We can translate "21 plus 15 times 3" into: 21+15*3=(the answer)
Step Three: Now, we solve: 21+15*3. Using order of operations, we first multiply as follows:
21+45=(the answer) Now, we add to find our sum
66=(the answer)
∴The answer is 66.
Best,
Star