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### Question

Each canvas of a group of canvases has as many dots as is the total number of canvases in that group of canvases. If there are 144 dots in all, how many canvases are there?

**A**

12.

**B**

14.

**C**

22.

**D**

16.

**Soln.**

**Ans: a**

Let the number of canvases = n. So dots in one canvas are also n, and therefore, dots in n canvases = $n^2$. We have been given $n^2 = 144$, which gives n = 12.