HKDSE Maths MCQ Speed Training 1 (20 mins)

• A. 0.015 (correct to 3 decimal places)

• B. 0.0157 (correct to 4 significant figures)

• C. 0.01571 (correct to 5 decimal places)

• D. 0.015707 (correct to 5 significant figures)

[Ref.: HKDSE 2019 Q.11 (76%)]

A sum of $20 000 is deposited at an interest rate of 12% per annum for 10 years, compounded monthly. Find the interest correct to the nearest dollar.

• A. $24 000

• B. $42 117

• C. $46 008

• D. $66 008

[Ref.: HKDSE 2018 Q.7 (73%)]

If f(x) = 5x² - 3x + 1, then f(2m - 1) =

• A. 10m² - 6m + 3.

• B. 10m² - 6m + 9.

• C. 20m² - 26m + 3.

• D. 20m² - 26m + 9.

[Ref.: HKDSE 2018 Q.10 (72%)]

Let a, b and c be non-zero constants. If 3a = 2c and b : c = 5 : 2, then (a + 2c) : (2b + c) =

• A. 3 : 7.

• B. 4 : 9.

• C. 5 : 11.

• D. 7 : 12.

[Ref.: HKDSE 2016 Q.10 (69%)]

Tommy has 200 tokens. The number of tokens that Jerry has is 40% of that of Tommy and the number of tokens Maisy has is 20% more than that of Jerry. The total number of tokens is

• A. 280.

• B. 320.

• C. 376.

• D. 520.

[Ref.: HKDSE 2019 Q.13 (69%)]

It is given that z varies as x and inversely as y. If x is decreased by 10% and y is increased by 20%, then z

• A. is increased by 25%.

• B. is increased by 50%.

• C. is decreased by 25%.

• D. is decreased by 50%.

[Ref.: HIKDSE 2018 Q.11 (67%)]

If z varies inversely as x and directly as the square of y, which of the following must be constant?

• A. xy²z

• B. x²yz²

[Ref.: HKDSE 2019 Q.12 (66%)]

The cost of coffee bean A is $58/kg. If 4 kg of coffee bean A and 6 kg of coffee bean B are mixed so that the cost of the mixture is $52/kg, find the cost of coffee bean B.

• A. $43/kg

• B. $46/kg

• C. $48/kg

• D. $55/kg

[Ref.: HKDSE 2019 Q.7 (63%)]

The solution of - 5x < 15 < 3x is

• A. x > -3.

• B. x > 0.

• C. x > 5.

• D. -3 < x < 5.