Question

EXERCISE 7.1
we know that
For example,
2 3 - 4
(D) 1.300
2
(A) 1:30
(D) 3:5
1. The simplest form of the ratio "1 day to 300 minutes" is
(C) 24 : 5
(B) 24: 300
2. The ratio between 3 litres and 1500 ml is
(B) 2:1
(C) 1:500
2 x 6 =
12
(A) 1:5
(D) 8:5
(C) 5:3
or
or
product of means (3 and
bc, then a
(A) 5:8
(B) 3:8
4. Find the ratio in the simplest form of each of the following:
(a) 11.50 and 3 4.60
(b) 2.5 litres and 750 ml
(c) 5.3 m and 53 cm
(d) 5.80 and 0.029
(e) 3.750 kg and 1.125 kg
(f) 11 minutes 55 seconds and 2 hours 11 minutes 5 seconds
Thus if ad =
match
From the above, we
proportion. We find t
and the product of
products
are equal
6. In a test, a student secured 162 marks in English and 216 marks in Mathematics. Find:
(a) the ratio between the marks in English and marks in Mathematics.
(b) the ratio between marks in Mathematics and the total marks secured.
7. (a) IFA: B = 1:3 and B: C = 2:3. find A : C. Also find A:B:C.
(6) If A:B = 3:4 and B : C = 7:9, find A:B:C.
(c) Find A : Cif A:B = 5:6 and B: C = 3:4.
(d) Find A:B:C if 3A = 2B = 6C.
8. Divide 76489 among Hema, Deepa and Sonam in the ratio 3:5:7.
In the ratio a: b.t
while in a proport
not be of the sa
quantities should
should be of the
numbers.
For example,
and 20 metr
have equal pocket money. How much pocket money did each of them have in the beginning?
=
5: 7. Find their present ages.
14. Anuj walks 25 km in 5 hours and Nitin walks 21 km in 7 hours. Find the ratio of their speeds.
a: b = c :d is also written as
a:
bc:d
7.4 Proportion
Thus 10
Select the correct answer from the alternatives given against each of the following (1-3):
ve product of extremes produc-
2, 3, 4 and 6 are in proportion.
3. In a class, there are 25 girls and 15 boys. The ratio between number of girls to the total number of
Hence, the product of ex
ad + bc, a, b, c, d are no
5. Out of the 960 students of a school, 600 students went to see a cricket match. Find the ratio between
number of students who went to see the cricket match and the number of students who did not go to
10. Two numbers are in the ratio 7:8. If 4 is added to both, the numbers are as 8:9. Find the numbers.
11. The sides of a triangle are in the ratio 2 : 3:4. If its perimeter in 45 cm, find the lengths of its sides.
9. Two numbers are in the ratio 5:6. If 8 is subtracted from each, the new numbers are in the ratio 4:5. Fudt
12. Hafiz and Suleman have their pocket money in the ratio 5:3. If Hafiz gives 20 to Suleman, both of them
13. The present ages of Mohini and Meenakshi are in the ratio 2 : 3. After two years, the ratio of their ages will be​

Answer 1

Answer:

2638638₹-₹8₹-₹8₹++"9*+*@@))