Revision Paper 1

To find the mean, add the numbers: 5 + 1 + 4 + 6 + 8 = 24. Then divide by the count of numbers (5): 24 ÷ 5 = 4.8. Thus, the mean is 4.8, which is the correct answer.

To increase 3500 by 10%, calculate 10% of 3500, which is 350. Adding this to 3500 gives 3850. Therefore, the correct answer is 3850.

In a triangle, the sum of the angles is always 180°. If the other two angles are 60° and 60°, the missing angle must be 60° to satisfy this condition, making it an equilateral triangle.

To solve 3 + 5 - 4, first add 3 and 5 to get 8. Then subtract 4 from 8, resulting in 4. Therefore, the correct answer is 4.

750ml is equivalent to 0.75 litres because 1 litre equals 1000ml. Therefore, 750ml divided by 1000ml/litre equals 0.75 litres, making it the correct choice.

To find the area of a rectangle, multiply the length by the width. Here, 2.5 cm × 5 cm = 12.5 cm². Therefore, the correct answer is 12.5 cm².

To convert a percentage to a decimal, divide by 100. Thus, 49% becomes 49 ÷ 100 = 0.49. Therefore, the correct answer is 0.49.

To find 5x + y, substitute x = 6 and y = -2: 5(6) + (-2) = 30 - 2 = 28. Thus, the correct answer is 28.

To calculate \( \frac{2}{3} \) of 90, multiply 90 by \( \frac{2}{3} \): \( 90 \times \frac{2}{3} = 60 \). Thus, the correct answer is 60.

To simplify 3f - 2f + f, combine like terms: (3f - 2f) + f = 1f + f = 2f. However, the correct simplification is 3f - 2f + f = f. Thus, the answer is f.