NBT NBT Quantitative Literacy: Ratios, Proportions and Rates 5

Question 1

A store offers 15% off the original price of R480. What is the sale price?

Accepted Answer

R408

Answer

Discount = 0.15 × 480 = R72; sale price = 480 − 72 = R408.

Question 2

Train A travels at 90 km/h and Train B travels at 60 km/h. If Train A departs at the same time as Train B, how much further has Train A travelled after 2.5 hours?

Accepted Answer

75 km

Answer

Train A: 90 × 2.5 = 225 km; Train B: 60 × 2.5 = 150 km; difference = 75 km.

Question 3

Concrete is mixed using cement, sand, and gravel in the ratio 1:2:4. How many kg of sand are needed to make 280 kg of concrete?

Accepted Answer

80 kg

Answer

Total parts = 1+2+4 = 7; sand = (2/7) × 280 = 80 kg.

Question 4

A school spent R9 600 on textbooks for 120 students. At this rate, how much would textbooks cost for 85 students?

Accepted Answer

R6 800

Answer

Cost per student = 9 600 ÷ 120 = R80; cost for 85 = 80 × 85 = R6 800.

Question 5

A car uses 9 litres of fuel per 100 km. How many litres are needed to travel 350 km?

Accepted Answer

31.5 litres

Answer

Fuel = (9/100) × 350 = 31.5 litres.

(NBT) National Benchmark Test Practice Test

(NBT) National Benchmark Test Practice Test

NBT NBT Quantitative Literacy: Ratios, Proportions and Rates 5