Solve 9*5-[20:(13-3*3)+1]*4:8}:6+15-12:6)=

$$9 \cdot 5 - [ 20 : ( 13 - 3 \cdot 3 ) + 1 ] \cdot 4 : 8 \} : 6 + 15 - 12 : 6 ) =$$

Evaluate

$$42$$

Solution Steps

Multiply 9 and 5 to get 45.

$$45-\frac{\left(\frac{20}{13-3\times 3}+1\right)\times 4}{8}$$

Multiply 3 and 3 to get 9.

$$45-\frac{\left(\frac{20}{13-9}+1\right)\times 4}{8}$$

Subtract 9 from 13 to get 4.

$$45-\frac{\left(\frac{20}{4}+1\right)\times 4}{8}$$

Divide 20 by 4 to get 5.

$$45-\frac{\left(5+1\right)\times 4}{8}$$

Add 5 and 1 to get 6.

$$45-\frac{6\times 4}{8}$$

Multiply 6 and 4 to get 24.

$$45-\frac{24}{8}$$

Divide 24 by 8 to get 3.

$$45-3$$

Subtract 3 from 45 to get 42.

$$42$$

Factor

$$2\times 3\times 7$$