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1.

a. 21             b. 42             c. 36             d. 57

2.

a. 16             b. 18             c. 20             d. 22

3.

a. 15             b. 14             c. 11             d. 9

4.

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6.

a. 7              b. 8              c. 10             d. 13

7.

a. 37             b. 29             c. 27             d. 24

8.

a. 20             b. 15             c. 8              d. 6

9.

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11.

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12.

a. 20             b. 25             c. 30             d. 35

13.

a. 9              b. 7              c. 6              d. 5

14.

a. 17             b. 23             c. 32             d. 39

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