Answer :

150 divided by 20 is 7 with a remainder of 10

The quotient is 7, but the answer is 8 I'm not sure if this is what you were looking for but I hope it helped
For question 2:
150÷20=7.5 (That doesn't work for the number of boxes)
20×7=140 so that means that they need 8 boxes because only 20 books can fit in each box and 150-140=10 and so those 10 books need their own box so it's 7+1=8

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