Start with
Exponents have the highest priority, so we evaluate 3 cubed first:
Next, we have to solve parenthesis first: we have 27-8 = 19, so the expression becomes
Multiplications and divisions have the same priority, so we perform them as they appear: 
, so the expression becomes
The probability of getting a red cube is 3:5 the probability of getting a blue cube is 2:5
2700 is the answer. You do 9 times 3 then add the 0s
129 + 6 = £135
135 (divided) 9 = 15
Therefore Colin worked 15 hours
Hope this helped :)
