Question 1: To find any fraction \( \frac{a}{b} \) of an amount \( N \), multiply \( N \) by \( \frac{a}{b} \). The formula is: \[ \text{Fraction of amount} = N \times \frac{a}{b} \]

Answer: N * a / b

Question 1: Calculate \( \frac{3}{4} \) of 48.

Answer: 36

Question 2: Find \( \frac{5}{8} \) of 64.

Answer: 40

Question 3: What is \( \frac{7}{10} \) of 100?

Answer: 70

Question 4: Calculate \( \frac{2}{3} \) of 81.

Answer: 54

Question 5: A shop has 150 apples. If \( \frac{2}{5} \) of the apples are sold, how many apples are sold?

Answer: 60

Question 6: A recipe requires \( \frac{3}{4} \) cup of sugar for one batch. How much sugar is needed for 5 batches?

Answer: 3.75

Question 7: Find \( \frac{4}{9} \) of 81.

Answer: 36

Question 8: A car travels 150 km. If \( \frac{2}{3} \) of the distance has been covered, how far has the car traveled?

Answer: 100

Question 9: A student scores 18 out of 30 in a test. What fraction of the total marks did they score? Express your answer as a simplified fraction.

Answer: 3/5

Question 10: A box contains 120 chocolates. If \( \frac{3}{8} \) of them are dark chocolates, how many dark chocolates are there?

Answer: 45

Question 11: A farmer has 240 liters of water. If \( \frac{5}{12} \) of the water is used for irrigation, how much water is used?

Answer: 100

Question 12: Identify and correct the mistake: To find \( \frac{2}{5} \) of 50, a student multiplies 50 by \( \frac{2}{4} \).

Answer: They should multiply by \( \frac{2}{5} \), not \( \frac{2}{4} \).