Question

Worksheet 3

1.Sahil buys eight books for 72. What is the cost 45 books?
2.The bus fare for 20 persons from Delhi to Chandigarh is 9,500. Find the bus fare
for 19 persons.
3.Arun earns 3,90,000 per year. Find his earnings for 25 weeks.
4.The cost of 18 kg wheat is 216. Find the cost of one quintal wheat.
5.Four erasers are purchased for * 10. Find the cost of one dozen erasers.
6.A worker earns 18,000 in 15 months.
(a) How much will the worker earn in seven months?
7.
(b) In how many months will he earn ₹3,600?
7.The weight of 72 books is 9 kg.
(a) Find the weight of 80 such books.
(b) How many books will weigh 6 kg?
answer with solution fast​

Answer 1

• 8 books → Rs. 72 [ unitary method]
• 45 books →

8

72 ×45=405 Rs.

__________________________

• Using unitary method

20 persons → Rs. 9500

1 person → Rs. 20/9500 =475

19 persons →20 persons −1 person

=9500−475

=9025 Rs.

_________________________

• Total earnings in 1 year =Rs.3,90,000

There are 52 weeks in a year.

So, earnings in 52 weeks =3,90,000

Earnings in 1 week = 52/390000 =7500

Earnings in 25 week =7500×25=187500

_______________________

• 1 Quintal = 100 kg.
• 18 kg wheat costs Rs 216
• 1 kg wheat will cost Rs 216/18 = Rs 12
• 100 kg wheat will cost Rs 12 × 100 = Rs 1200
• Therefore, 1 Quintal wheat will cost Rs 1200.

________________________

• 1 dozen erasers = 12 erasers.
• If 4 erasers are worth ₹10,
• 12 erasers would be worth - ₹10 × 3 = ₹30.

________________________

• Earning in 15 months = Rs. 18000.
• Earning in 1 month = 18000/15
• = Rs. 1200

Therefore, Earning in 7 months = 1200* 7= Rs.8400

Number of months to earn Rs. 30000

= 30000/1200

= 25.

_______________________

• 72 books=9kg
• 1 book = 9/72 kg =1/8 kg
• 80 books = 80*1/8=10 kg
• 1book = 1/8 kg

1kg =8 book

6kg=8*6=48 books