Page 149 - Start Up Mathematics_4

Example 13: How many days are there in 3 weeks?
Maths Fun
Solution: 1 week = 7 days

3 weeks = (3 × 7) days = 21 days Which month has 28 days?
1
Example 14: Convert 3 days to hours.
2
Solution: 1 day = 24 hours
1 1 7 12
3 days = 3 × 24 hours = × 24 hours = 84 hours
2 2 2
Example 15: A family went for a trip to Malaysia. They left on 31 October. They came back
after 4 weeks. How many days did they spend in Malaysia? Calculate the date
of their return.

Solution: 1 week = 7 days 4 weeks = (4 × 7) days = 28 days

Date of leaving = 31 October Days spent = 28 days
Date of return = 28 days after 31 October = 28 November
Example 16: Surbhi did a computer course from 15 June to 3 July. What is the duration of
the course?

Solution: Number of days of the course in June = 30 – 14 = 16

(Subtract 14 days since 15 June is included in the course)
Number of days of the course in July = 3
Duration of the course = 16 days + 3 days = 19 days

EXERCISE 10.7

1. Convert the days to hours.
1 1
(a) 1 days (b) 3 days (c) 5 days (d) 2 days
2 2
1 1
(e) 9 days (f) a fortnight (g) 3 days (h) 2 days
4 4
(Hint: A fortnight = 15 days)

2. Convert the years to months.
1
(a) 2 years (b) 1 years (c) 4 years (d) 6 years
2
1 1
(e) 5 years (f) 2 years (g) 3 years (h) 4 years
4 2
3. Convert the weeks to days.
1 1
(a) 8 weeks (b) 2 weeks (c) 1 weeks (d) 4 weeks
2 2
1
(e) 6 weeks (f) 7 weeks (g) 5 weeks (h) 2 weeks
4

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