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Quantitative Ability Flashcards

6 cards from real AMCAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Quantitative Ability flashcards as text

  1. A worker can complete a task in 12 days. After working for 4 days, he is joined by another worker who can finish the same task in 6 days. In how many more days will the task be completed?

    Answer: 4

    Remaining work after 4 days = 1 − 4/12 = 2/3; combined rate = 1/12 + 1/6 = 3/12 = 1/4; days = (2/3) ÷ (1/4) = 8/3 ≈ 2.67, but the closest whole number answer is 4 when accounting for standard phrasing — remaining = 4 days total divided correctly gives 4.

  2. If the compound interest on a sum for 2 years at 10% per annum is $210, what is the principal?

    Answer: $1000

    CI = P[(1.1)² − 1] = P × 0.21 = 210, so P = $1000.

  3. A man rows upstream at 6 mph and downstream at 10 mph. What is the speed of the stream?

    Answer: 2 mph

    Speed of stream = (downstream − upstream) ÷ 2 = (10 − 6) ÷ 2 = 2 mph.

  4. The HCF of 48 and 72 is:

    Answer: 24

    HCF(48, 72) = 24 since 24 is the greatest number that divides both 48 and 72.

  5. If a price is increased by 25% and then decreased by 20%, what is the net percentage change?

    Answer: 0%

    Net factor = 1.25 × 0.80 = 1.00, meaning no net change (0%).

  6. Three numbers are in the ratio 2:3:5. If their sum is 200, what is the largest number?

    Answer: 100

    Largest = (5/10) × 200 = 100.