The following expressions are possible ways of using 9 and 10 to get 21:

- 9 + 10 - 9 + 10 - 9 + 10
- ( 9 × 9 ) - 10 - 10 - 10 - 10 - 10
- 9 ( 9 + 10 ) - ( 10 × 9 ) - ( 10 × 9 ) + 10 + 10 + 10
- 9 + 10
- 9 × 10 - 9 + 10 - ( 9 × 10 ) + 10 + 10
- 9 + 10 + 10 + 10 - 9 - 9 ( -9 + 10 )

What is the sum of the #s of the 4 expressions that actually equal 21? (Assume the expressions were 1, 4, 5, and 6. Add them all up to get the answer you are looking for.)

×

Problem Loading...

Note Loading...

Set Loading...