Q4 of 59 Page 61

Three persons can build a small house in 8 days. To build the same house in 6 days, how many persons are required?

No. of persons required to build a house in 8 days =3
No. of persons required to build a house in 1 day =3×8 = 24
No. of persons required to build a house in 6 days = 24/6 = 4


∴ 4 persons are required to build the same house.


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2

Find the reduced form of the ratio of the first quantity to second quantity.

i. 700 Rs, 308Rs.


ii. 14Rs, 12 Rs.40 paise.


iii. 5 litre, 2500 ml


iv. 3 years 4 months, 5 years 8 months


v. 3.8 kg, 1900 gm


vi. 7 minutes 20 seconds, 5minutes 6 seconds.

 3

Express the following percentages as ratios in the reduced form.

(i) 75 : 100


(ii) 44 : 100


(iii) 6.25%


(iv) 52 : 100


(v) 0.64%

 5

Convert the following ratios into percentage.

(i) 15 : 25


(ii) 47 : 50


(iii) 7/10


(iv) 546/600


(v) 7/16

 6

The ratio of ages of Abha and her mother is 2 : 5. At the time of Abha's birth her mother’s age was 27 year. Find the present ages of Abha and her mother.