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Exam-Style Questions.Problems adapted from questions set for previous Mathematics exams. |
1. | GCSE Higher |
The Billing triplets are planting seedlings on the first day of the month. The three of them take two hours to plant 300 seedlings.
(a) On the second day of the month the triplets are joined by their friend Billy who helps them. Working at the same rate, how many plants should the four of them be able to plant in two hours?
(b) Working at the same rate, how much longer would it take four people to plant 1000 seedlings than it would take five people?
(c) Billy says that it took two hours for three people to plant 300 seedlings. If I assume they work all day, then in one day three people will plant 3600 seedlings because 300 × 12 = 3600.
Why is Billy's assumption not reasonable? What effect has Billy's assumption had on his answer?
2. | GCSE Higher |
A Primary school asked 9 children to remove the weeds from the school gardens. The gardens measured 100m2 in total and the job was completed in 10 hours (spread over many weeks).
(a) The school was asked to find volunteers to weed another garden measuring 250m2 at a nursing home. This work has to be completed in 15 hours.
Calculate the least number of children the school needs to find for this work.
(b) State one assumption you have made in your answer to part (a). How would your answer to part (a) change if you did not make this assumption?
3. | GCSE Higher |
People are paid to paint polygons.
There are eight people in the polygon painting posse.
All of the people paint at the same rate.
When all of the people are painting, they can paint all of the polygons in the palace in ten days.
The table shows the number of people painting each day:
| Day 1 | Day 2 | Day 4 | All other days | |
| Number of people painting | 3 | 6 | 7 | 8 |
Work out the total number of days taken to paint all of the polygons in the palace.
4. | GCSE Higher |
Which of the following statements are correct if \(xy = c\) and \(c\) is a constant.
5. | GCSE Higher |
If \(a\) is inversely proportional to \(b\) and \(b\) is directly proportional to \(c^2\) find a formula for \(a\) in terms of \(c\) given that \( a=20 \) and \(c = 4 \) when \(b = 8 \).
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