Question

Oliver is stacking plates in his restaurant. He puts 3 in the first stack, 6 in the second stack, and 9 in the third stack. If this pattern continues, how many plates will be on the 10th stack?

• A. 20
• B. 12
• C. 30
• D. 27

Answer 1

The correct option is C 30

The given sequence is 3, 6, 9.

Difference between the 1st and the 2nd terms = 6 - 3 = 3

Difference between the 2nd and the 3rd terms = 9 - 6 = 3

Hence, we have to add 3 to find the next term in the sequence.

Therefore, the sequence is 3, 6, 9, 12, 15, 18, 21, 24, 27, 30.

Hence, 30 plates will be placed on the 10th stack.