Grace spent 15 minutes on her math homework that was 30% of the total number of minutes she spent doing her homework how many times how many minutes did she spend doing homework

You would see how much of a percentage she had left in her homework 30 + 70 = 100.
Then see how many times 15 can go into 100. We will do this simple 15+15=30 30+15=45 45+15=60 60+15=75 75+15=90. Ok so now we see we can’t go any further. So now we need to find that last number to get to 100% which would be 10. 90+10=100. So we now know that our answer is 15 with a remainder of 10! Hope this helped idk if I did it right lol-

Answer is either b or c