- Basic Math and Science Ratios, Proportions, and Percentages Questions and Answers Flashcards
7 cards from real BMST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 - Basic Math and Science Ratios, Proportions, and Percentages Questions and Answers flashcards as text
A solution is 15% salt by weight. If you have 200 grams of the solution, how many grams of salt does it contain?
Answer: 30 grams
15% of 200 = 0.15 × 200 = 30 grams of salt.
A car travels 180 miles using 6 gallons of gas. At this rate, how many gallons are needed for a 270-mile trip?
Answer: 9 gallons
Set up the proportion 180/6 = 270/x, giving x = 270 × 6 / 180 = 9 gallons.
The ratio of boys to girls in a class is 3:5. If there are 24 boys, how many students are in the class total?
Answer: 64
If 3 parts = 24, then 1 part = 8; total parts = 3 + 5 = 8, so total students = 8 × 8 = 64.
An item originally priced at $80 is marked down by 35%. What is the sale price?
Answer: $52.00
Discount = 35% × $80 = $28; sale price = $80 − $28 = $52.00.
If 5 workers can complete a task in 12 days, how many days would it take 10 workers to complete the same task?
Answer: 6 days
This is inverse proportion: 5 × 12 = 10 × d, so d = 60 / 10 = 6 days.
What percentage is 45 out of 180?
Answer: 25%
45 / 180 × 100 = 0.25 × 100 = 25%.
A recipe uses flour and sugar in a ratio of 4:1. If you need 20 cups of flour, how many cups of sugar do you need?
Answer: 5 cups
If flour is 4 parts and flour = 20 cups, then 1 part = 5 cups, so sugar = 1 × 5 = 5 cups.