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7-81)   Arpan started to read a novel and he read 15 pages a day. After 6 days, 3/8ths of the book was left. How many pages are there in the book?

7-82) Amy started reading a book on Saturday. She read 18 pages a day. After 8 days, 4/7ths of the book was left. How many pages are there in the book?

7-83) If 3#2 = 7, 4#3 = 10, 13#5 = 23, calculate 31#20.

7-84) Farmer Bob sells freshly picked tomatoes on Sunday. He sold 2/7ths (in weight) of all his tomatoes in the first hour. In the second hour, he sold 12 pounds and he has 48 pounds left. How many pounds of tomatoes did he have at the beginning of the day?

7-85) Farmer Kirk sells freshly picked apples on a Sunday. He sold 1/5th (in weight) of all his apples in the first hour. In the second hour, he sold 14 pounds and he has 52 pounds left. How many pounds of apples does he have at the beginning of the day?

7-86) Ben and Ken opened a box of Lego parts. Ben took 60 pieces. Ken took the remaining which is 1/3 of all pieces plus 2. How many Lego pieces in all were in the box?

7-87) When water becomes ice, its volume increases by 10%. When ice melts into water, how much does its volume change in percentage?

7-88) Alex started reading a biography book. He read 1/8 of the book plus two pages after three days. There are 61 pages left. How many pages are there in the book.?

7-89) Josh solves math problems in a book to prepare for a math competition. He solved 82 problems. 2/5ths plus 5 problems are left. How many problems are there in all the book?

7-90) Patrick’s truck uses 4 gallons of gasoline a day. He filled up the tank on Monday morning and 1/7th is left on Saturday night. How many gallons of gasoline did Patrick fill on Monday morning?

More challenging math problems for seventh grade:
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61-70
71-80  81-90