Question

Kyle Eunice has 78 blocks. She stacked it in such a way that the topmost row has one block, the row below it has two blocks, and row below it has three blocks, and so on. How many rows does this stack have?

Answer 1

12

Explanation:

1

2

3

4

5

6

7

8

9

10

11

12

1+2+3+4+5+6+7+8+9+10+11+12=78