Question

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eron and Global warming,
Q3. Find ratio between disease caused by TB and Lung m
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Q4. According to environmentalist, students should use cycles for going to school to
control growing pollution. Cost of buying a cycle is Rs 7,000. After 5 years cost decreases
by 5%. Find selling price of cycle after 5 years?
Q5. According to doctors if air purifier cleans the air at the rate of 5cm3/sec. How much
time will it take to clean the room having 600cm of air?​

Answer 1

Selling price of cycle after 5 years = Rs 6650 , Air purifier will take 2 Mins

Step-by-step explanation:

Cost of buying a cycle is Rs 7,000. After 5 years cost decreases

by 5%. Find selling price of cycle after 5 years

Cost Price = 7000

reduction in price in 5 Years = 5 %

5 % reduction = (5/100)*7000 = Rs 350

Selling Price of cycle = 7000 - 350  = Rs 6650

selling price of cycle after 5 years = Rs 6650

air purifier cleans the air at the rate of 5cm³/sec. How much

time  it will take to clean the room having 600cm³ of air =  600/5  = 120 Sec

= 2 Mins

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