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7-36)   Prove the following:

m - n         n - m
---------- =  ----------
x - y          y - x

7-37)   The diameters of the 3 circles on the target are 2 cm, 4 cm and 8 cm.  What percent of the target is purple?

7-38)   A store has a sale on products A and B. Both products are on sale by 25% off. At the sale price, products A costs 15% more than products B. How much more does product A cost than product B before the sale in percentage?

7-39)  Two circles overlap. The area of the overlapped region is 1/2 of the small circle's area and is 1/3 of the large circle's area. What is the ratio of the area of the small circle to the large circle?

7-40) Two squares overlap. The area of the overlapped region is 1/4 of the small square's area and is 2/9 of the large square's area. What is the ratio of the area of the small square to the large square?

More challenging math problems for seventh grade:
1-5   6-10   11-15   16-20   21-25   26-30   31-35  36-40  41-45  46-50   51-60
61-70
71-80  81-90