What is a multiplication word problem for 15 times 15

"A student needs to ask for help on 15 different homework assignments, each containing 15 problems. How many problems does the student need to ask for help on altogether?"

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.