Math Flashcards
7 cards from real Crossover Aptitude Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Math flashcards as text
The average of five numbers is 18. Four of them are 14, 20, 22, and 16. What is the fifth number?
Answer: 18
Total sum = 5 × 18 = 90; 90 - 72 = 18.
A rectangle has a perimeter of 48 cm and a width of 10 cm. What is its area?
Answer: 140 cm²
Length = (48/2) - 10 = 14 cm; Area = 14 × 10 = 140 cm².
Solve for x: 3(x - 4) = 2x + 1
Answer: 13
3x - 12 = 2x + 1, so x = 13.
A train travels from City A to City B in 3 hours at 80 mph. What is the distance?
Answer: 240 miles
Distance = 80 × 3 = 240 miles.
What is the least common multiple (LCM) of 12 and 18?
Answer: 36
12 = 2²×3, 18 = 2×3²; LCM = 2²×3² = 36.
If f(x) = 2x² - 3, what is f(-3)?
Answer: 15
f(-3) = 2(9) - 3 = 18 - 3 = 15.
A number is increased by 25% and then decreased by 25%. What is the net percentage change?
Answer: 6.25% decrease
1.25 × 0.75 = 0.9375, a 6.25% decrease from the original.