Mathematical Reasoning (Fractions, Percentages)

A school has 1,000 students. If 40% of the students are boys, how many girls are there in the school?

• 40

• 400

• 600

• None of these

John has 20 marbles. If he gives away 25% of them, how many marbles will he have left?

• 5

• 10

• 15

• None of these

If the ratio of boys to girls in a class is 3:5, and there are 24 students in the class, how many boys are there?

• 6

• 9

• 15

• 20

A rectangle has a length of 10 cm and a width of 5 cm. What is the perimeter of the rectangle?

• 15 cm

• 30 metres

• 20 cm

• 30 cm

If the area of a square is 64 square units, what is the length of one side of the square?

• 32

• 24

• 16

• 8

A company has three factories that produce a certain product. The first factory produces 40% of the product, the second produces 30%, and the third produces 30%. If a randomly selected product is found to be defective, what is the probability that it came from the first factory?

• 0.30

• 0.40

• 0.50

• 0.60

Tony and Lisbeth obtained the same score for hitting a target with a ball. Tony hit the target four times in five shots. Lisbeth hit the target 12 times. Find out how many shots Lisbeth had in total?

• 15

• 20

• 25

• 18

• 620

• 760

• 820

• 880

• $36

• $44

• $54

• none of these

In a box of sweets ¹/₂ of the sweets are gold. The rest are purple.

What is the ratio of gold sweets to purple sweets?

• 1 : 1

• 1 : 2

• 2 : 1

• 1 : 3