Question 10... The answer to this would be
. Dividing the cost by the number of apples
works out the cost per single apple. Then multiplying this value by
gives the cost of
For question 11, since 25% is a quarter of 100%, 12 students must be a quarter of the class. So to calculate the size of the class, simply do
Question 12... Okay, I'm not good at explaining things like this, and I'm not even sure my answer's right. All I did was
(this calculates the proportion of the graduating class that took 6 or 7 courses i.e. 15%), then I added this to the ones who did 8 or more maths courses, so 75% + 15% = 90%, meaning the remaining 10% must do fewer than 6 maths courses. So the answer's 10% I think.