What is the value of 21 + 12 - (35-8) times 3?

-48

Explanation:

Parenthesis

Exponents

Multiply

Divide

Add

Subtract

If you have a tie, go left to right.

This is the order you solve ALL problems in such situations.

21 + 12 - (35-8) * 3

21 + 12 - 27 * 3

21 + 12 - 81

33 - 81 = - 48

To reiterate:

1. Solve parenthisis. (35-7) = 27.

2. Multiply. 27 * 3 = 81

3. Add. 21 + 12 = 33

4. Subtract. 33 - 81 = - 48