Mental Maths Class 5 Comparing Quantities

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

If 4 water purification tablets can clean 20 litres of water, how many tablets are needed for 45 litres?

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A 8 tablets
B 9 tablets
C 10 tablets
D 12 tablets

Show answer and explanation

Answer: B. 9 tablets

Answer: B) 9 tablets
Explanation: First, find the "unit rate." 4 tablets for 20 litres means 1 tablet cleans 5 litres (20 ÷ 4). To clean 45 litres, you need 45 ÷ 5 = 9 tablets.

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If 4 water purification tablets can clean 20 litres of water, how many tablets are needed for 45 litres?

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