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6 questions · self-marked practice — reveal the answer and mark yourself.

Question 12 Marks
Rohan can paint \(\frac{1}{3}\) of a painting in 6 days. How many days will he take to complete the painting?
Answer
Rohan can paint \(\frac{1}{3}\text{rd}\) of a painting in 6 days.
\(\therefore\) Time taken by Rohan to complete the painting = (6 × 3) days = 18 days.
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Question 22 Marks
8 men can do a piece of work in 9 days. In how many days will 6 men do it?
Answer
It is given that 8 men can complete a job in 9 days.
\(\therefore\) Time taken by 1 man to complete the same job = (8 × 9) = 72 days
\(\therefore\) Time taken by 6 men to complete the same job \(=\frac{72}{6}=12\) days.
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Question 32 Marks
6 men can complete the electric fitting in a building in 7 days. How many days will it take if 21 men do the job?
Answer
It is given that 6 men can complete a job in 7 days.
\(\therefore\) Time taken by 1 man to complete the same job = (6 × 7) = 42 days
\(\therefore\) Time taken by 21 men to complete the same job \(=\frac{42}{21}=2\) days.
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Question 42 Marks
Neha types 75 pages in 14 hours. How many pages will she type in 20 hours?
Answer
It is given that Neha types 75 pages in 14 hours.
\(\therefore\) Number of pages typed by her in 1 hour \(=\frac{75}{14}\)
\(\therefore\) Number of pages typed by her in 20 hours \(=\Big(\frac{75}{14}\times20\Big)\) pages
\(=\frac{1500}{14}\) pages
\(=\frac{750}{7}\) pages
\(=107\frac{1}{7}\) pages
Thus, Neha types \(107\frac{1}{7}\) pages in 20 hours.
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Question 52 Marks
Working 8 hours a day, Ashu can copy a book in 18 days. How many hours a day should he work so as to finish the work in 12 days?
Answer
If Ashu works for 8 hours daily, he can finish the work in 18 days
If he works for 1 hour daily, he can finish the work in (18 × 8) days or 144 days.
\(\therefore\) Number of hours he should work daily to finish the work in 12 days \(=\frac{144}{12}=12\)
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Question 62 Marks
Reema weaves 35 baskets in 25 days. In how many days will she weave 55 baskets?
Answer
It is given that Reema weaves 35 baskets in 25 days.
\(\therefore\) Time taken by her to weave 1 basket \(=\frac{25}{35}\) days
\(\therefore\) Time taken by her to weave 55 baskets \(=\Big(\frac{25}{35}\times55\Big)\) days.
\(=\frac{1375}{35}\) days \(=\frac{275}{7}\) days \(=39\frac{2}{7}\) days
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