Question:

Level 3

Some oil is leaking from a crack of a bottle. After z minutes, the volume, V, of the oil left in the bottle is given as V = 40(100 - 5z) cm^{3}. How much oil will be left in the tank after 10 minutes? Give your answer in litres.

3 m
Some oil is leaking from a crack of a bottle. After z minutes, the volume, V, of the oil left in the bottle is given as V = 40(100 - 5z) cm

Level 3

Mrs Jensen paid a total of $38 for 3n pens and 4 markers. Each pen cost $2.

3 m
Mrs Jensen paid a total of $38 for 3n pens and 4 markers. Each pen cost $2.

- Express the cost of 1 marker in terms of n.
- If n = 4, how much did each marker cost?

Level 3

A van travels 20 km in 5r minutes. How far will it travel in k hours?

3 m
A van travels 20 km in 5r minutes. How far will it travel in k hours?

Level 3

The cost price of a necklace was $9w. Dorothy decided to make 10% profit from the necklace. During a sale, a customer bought the necklace at a discount of 10%. What was Dorothy's loss?

4 m
The cost price of a necklace was $9w. Dorothy decided to make 10% profit from the necklace. During a sale, a customer bought the necklace at a discount of 10%. What was Dorothy's loss?

Level 3

Ali is b years old. Bill is four times as old as Ali and Calvin is 6 years younger than Bill.

4 m
Ali is b years old. Bill is four times as old as Ali and Calvin is 6 years younger than Bill.

- Express Calvin's age in terms of b.
- Ali is 10 years old as of now. ln how many years' time will Calvin be 3 times as old as Ali?

Level 3

The figure shows 2 rectangles. The length of the bigger rectangle is (6m + 8) cm and the breadth is half its length. Find the perimeter of the smaller rectangle.

The figure shows 2 rectangles. The length of the bigger rectangle is (6m + 8) cm and the breadth is half its length. Find the perimeter of the smaller rectangle.

4 m

Level 3

The perimeter of triangle A is equal to that of rectangle B.

The perimeter of triangle A is equal to that of rectangle B.

- Find the length of rectangle B in terms of k.
- If k = 3, find the area of rectangle B.

4 m

Level 3

One pencil costs $x. One pen costs $(x + 20). One ruler costs $4x.

4 m
One pencil costs $x. One pen costs $(x + 20). One ruler costs $4x.

- Vince bought 2 pencils, 3 pens and 1 ruler. How much did he spend? Simplify your answer in terms of x.
- If x = 20, how much did Vince spend altogether?

Level 3

A rectangle has a length of 6p cm and a breadth of 4q cm. Find

4 m
A rectangle has a length of 6p cm and a breadth of 4q cm. Find

- its area in terms of p and q,
- its perimeter in terms of p and q,
- the area of the rectangle if p = 2 and q = 3.