Question

AND WRITE
EXERCISE 8.1
An ant can carry 50 times its weight. If a person can do the same, how much would
be able to carry?
1. Find the ratio of:
2. Ina computer lab, there are 3 computers for every 6 students. How many
computers will be needed for 24 students?
(b) 15 kg to 2105
(d) 30 days to 36 hours
Population of Rajasthan = 570 lakhs and population of UP-1660 lakhs.
Area of Rajasthan = 3 lakh km and area of UP=2 lakh km.
(1) How many people are there per km in both these States?
Which State is less populated?
(a) 85 to 50 paise
(c) 9 m to 27 cm​

Answer 1

Answer:

2answer is 2 students get 1 computer

so 24 students would get 12 computers

Answer 2

Answer:

Exercise 8.1

Question 1:

Find the ratio of:

(a) 5 to 50 paise

(c) 9 m to 27 cm

(b) 15 kg to 210 g

(d) 30 days to 36 hours

To find ratios, both quantities should be in same unit.

(a) 5 to 50 paise

Answer 1:

5 x 100 paise to 50 paise

500 paise to 50 paise

[ 1 = 100 paise]

Thus, the ratio is = 500 10 = 50 1 = 10:1

(b) 15 kg to 210 g

15 x 1000 g to 210 g

15000 g to 210 g

[ 1 kg = 1000 g]

Thus, the ratio is = 15000 210 500 7 = = 500: 7

(c) 9 m to 27 cm

9 x 100 cm to 27 cm

[ 1 m = 100 cm]

900 cm to 27 cm

Thus, the ratio is = 900 100 27 3 = 100:3

(d) 30 days to 36 hours

30 x 24 hours to 36 hours

720 hours to 36 hours

→

[ 1 day = 24 hours]

Thus, the ratio is = 720 20 = 36 1 = 20:1

Question 2:

In a computer lab, there are 3 computers for every 6 students. How many computers will be needed for 24 students?

Answer 2:

6 students need = 3 computers

3 1 student needs = = computers 6

3 24 students need = x 24 = 12 computers 6

Thus, 12 computers will be needed for 24 students.

Question 3:

Population of Rajasthan = 570 lakhs and population of U.P. = 1660 lakhs. Area of Rajasthan = 3 lakh km² and area of U.P. = 2 lakh km².

(1) How many people are there per km² in both states? (ii) Which state is less populated?

Answer 3:

(i)

People present per km² = In Rajasthan = In U.P. = 570 lakhs Population Area 3 lakhs per km² 1660 lakhs 2 lakh per km = 190 people km² = 830 people per km²

Rajasthan is less populated.