Q1 of 31 Page 259

If the cost of 7m of cloth is Rs. 294, find the cost of 5 m of cloth.

It is given in the question that,


 


Cost of 7 m of cloth = Rs. 294


 


Cost of 1 m of cloth = (Rs. 297)/4= Rs.42


 


Therefore,


 


Cost of 5 m of cloth = 5× Cost of 1m cloth = Rs. 42 × 5 = Rs. 210


 

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3

Are the following statements true?

(a) 40 persons : 200 persons = Rs. 15 : Rs. 75


(b) 7.5 litres : 15 litres = 5 kg ; 10 kg


(c) 99 kg : 45 kg = Rs. 44 : Rs. 20


(d) 32 m : 64 m = 6 sec : 12 sec


(e) 45 km : 60 km = 12 hours : 15 hours.

 4

Determine if the follow ratios form a proportion. Also, write the middle terms and extreme terms where the ratio forms a proportion.

(a) 25 cm : 1 m and Rs. 40 : Rs. 160


(b) 39 litres : 65 litres and 6 bottles : 10 bottles


(c) 2 kg : 80 kg and 25 g : 625 g


(d) 200 mil : 2.5 litres and Rs. 4 : Rs. 50

 2

Ekta earns Rs 1500 in 10 days. How much will she earn in 30 days?

 3

If it has rained 276 mm in the last 3 days, how many cm of rain will fall in one full week (7 days)? Assume that the rain continues to fall at the same rate.