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Practice each question, then open the answer or worked solution.
Question: 21
Total water used by them?
Water used in cooking and drinking = 30 L
Water used in washing clothes = 40 L
Water used in cleaning pots, pans = 20 L
Water used in bathing = 75 L
Total water used = 30 L + 40 L + 20 L + 75 L
= 165 L
Therefore, total water used by them = 165 L
Question: 22
How many litres of water does your family use in a day? Guess and fill in this table.
NCERT book Page No: 79-80
Drops and Drops Make an Ocean
Question: 23
Is there any tap in your school or your home which is leaking?
Answer: No, there is no tap which is leaking.
Question: 24
How much water do you think we waste through a leaking tap?
Answer: I think nearly 40 litres of water is wasted through a leaking tap every day.
Question: 25
Place your litre jar below the leaking tap so as to catch all the drops in the bottle. Note the time. After one hour check how much water is in the bottle.
Answer: After one hour, water collected in bottle = 1 L
Question: 26
Find out how much water is wasted in a day?
(a) In a week?
(b) In a month?
(c) In a year?
Answer: In one hour, water wasted = 1 L
Therefore, in 24 hours, water wasted = 1 L × 24
= 24 L
Hence, 24 L of water is wasted in a day.
(a) Water wasted in a day = 24 L
Water wasted in 7 days = 24 L × 7
= 168 L
(b) Water wasted in a day = 24 L
Hence, in a month, which has 30 days, water wasted = 24 L × 30
= 720 L
(c) Water wasted in a month = 720 litre
The water wasted in 12 months or a year = 720 L × 12
= 8640 L
Chelannur village has a milk society. Geetha and Ammini went there to buy 4 litres of milk. But the man could not find the one litre measure. He had only a 3 litre and a 5 litre bottle with him. But he gave them exactly 4 litres of milk.
Question: 27
Explain how he did this.
At first, the milkman will fill 5 litre bottle. Now, he pours its content into the 3 L bottle, and then the milk left in the 5-litre bottle will be 2 litres. He pours this 2 litre of milk into Geetha’s bottle. Again he repeats the same process and again pours 2 litres of milk left in the 5-litre bottle into Geetha’s bottle. Hence, Geetha has 4 litres of milk in her bottle now. In this way, he gave them exactly 4 litres of milk.
Solution coming soon.