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Practise
[mq] Set 4: Ratio Proportion (Challenging) 1. A bacteria culture doubles every 10 minutes. By what percent does the population increase in 40 minutes? 400% 800% 1,500% 1,500% 1,600% Check Solution (C/D): Doubling periods: \(40/10 = 4\). Growth factor: \(2^4 = 16\). Start with 1, end with 16. Increase = \(16 – 1 = 15\)….
[mq] Set 3: Ratio and Proportion (Harder) 1. A’s income is 20% less than B’s. B’s income is 25% less than C’s. What percent of C’s income is A’s income? 55% 60% 45% 80% 75% Check Solution (B): Let C = 100. B is 25% less than C = 75. A is 20% less than…
[mq] Work & Rate: Level 2 1. Machine A can complete a job in 10 hours. Machine B can complete the same job in 15 hours. How long will it take if they work together? 5 hours 12.5 hours 6 hours 8 hours 7.5 hours Check Solution (C): Rate A = 1/10, Rate B =…
[mq] Set Theory: Level 1 1. If Set A has 10 members, Set B has 15 members, and they have 5 members in common, how many members are in \( A \cup B \) (A or B)? 25 20 15 30 10 Check Solution (B): Formula: \( n(A \cup B) = n(A) + n(B) –…
[mq] SI / CI / Growth: Level 1 1. What is the simple interest earned on $2000 invested at 5% annual interest for 3 years? $100 $200 $300 $315 $350 Check Solution (C): Formula: \( I = P \times r \times t \). \( I = 2000 \times 0.05 \times 3 = 100 \times 3…
[mq] Age & Digits: Level 1 1. John is 15 years old. How old will he be in 7 years? 21 22 20 23 19 Check Solution (B): \( 15 + 7 = 22 \). 2. The sum of the digits of the number 57 is: 35 2 12 11 13 Check Solution (C): \(…