Question

EXERCISE 8.1
1. Find the ratio of:
2. In a computer lab, there are 3 computers for every 6 students. How many
computers will be needed for 24 students?
3. Population of Rajasthan=570 lakhs and population of UP=1660 lakhs.
(a) *5 to 50 paise
(c) 9 m to 27 cm
(b) 15 kg to 210 g
(d) 30 days to 36 hours
Area of Rajasthan = 3 lakh km and area of UP=2 lakh km².
1) How many people are there per km² in both these States?
i) Which State is less populated?​

Answer 1

2

let computers needed be x

3/6= x/24

cross multiply

3×24=6x

72=6x

x= 72/6

x= 12

12 computers will be needed for 24 students

ration= 1:2

3

ratio = 570/1660 = 57/166 = 57:166

5rs to 50 paise = 500 paise to 50 paise

= 500/50= 50/5= 10/1

ratio= 10:1

5 paise to 50 paise

ratio= 5/50= 1/10 = 1:10

9m to 27cm

900cm to 27cm

900/27= 300/9= 100/3

ratio= 100:3

15 kg to 210g

15000g to 210g

15000/210= 5000/70= 500/7

ratio= 500:7

30 days to 36 hours

30×24 h to 36 h

720 hours to 36 hours

720/36= 360/18= 20/1

ratio= 20:1

area of rajasthan to area of up

ratio= 3:2

population is not given