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Percentages Ratios and Proportions Flashcards

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

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  1. A tank is 40% full with 120 gallons. What is the tank's total capacity?

    Answer: 300

    0.40 × total = 120 → total = 120/0.40 = 300 gallons.

  2. A runner completes a 5-mile race in 40 minutes. What is their speed in miles per hour?

    Answer: 7.5 mph

    Speed = 5 miles / (40/60) hours = 5 / (2/3) = 7.5 mph.

  3. The ratio of teachers to students in a school is 1:18. If there are 540 students, how many teachers are there?

    Answer: 30

    1/18 = t/540 → t = 540/18 = 30 teachers.

  4. A jacket is marked up 40% from its wholesale price of $70. What is the retail price?

    Answer: $98

    Markup = 40% × $70 = $28. Retail = $70 + $28 = $98.

  5. A solution is 15% salt. How many grams of salt are in 200 grams of solution?

    Answer: 30

    15% × 200 = 0.15 × 200 = 30 grams of salt.

  6. In a class of 36 students, 25% are left-handed. How many students are left-handed?

    Answer: 9

    25% × 36 = 0.25 × 36 = 9 students.

  7. If 5 workers complete a job in 12 days, how many days would it take 10 workers to complete the same job?

    Answer: 6

    This is inverse proportion. 5 × 12 = 10 × d → d = 60/10 = 6 days.

  8. A stock's price rose from $50 to $65. What is the percentage increase?

    Answer: 30%

    Percent increase = (15/50) × 100 = 30%.