Q22 of 41 Page 11

In 10 days, the earth picks up pounds of dust from the atmosphere. How much dust will it pick up in 45 days?

Let the weight of dust picked up is pounds














Time (days)



10





Weight of dust (pounds)



2.6× 108






On cross multiplication, we get




Therefore the weight of dust picked up is 11.7 × 108 pounds


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20

The anount of extension in an elastic string varies directly as the weight hung on it. If a weight of 150 gm produces an extension of 2.9 cm, then what weight would produce an extension of 17.4 cm?

 21

The anount of extension in an elastic spring varies directly with the weight hung on it, If a weight of 250 gm produces an extension of 3.5 cm, find the extension produced by the wight of 700 gm.

 23

In 15 days, the earth picks up kg of dust from the atmosphere. In how many days it will pick up kg of dust?

 1

In which of the following tables x and y vary inversely:

(i)


















X



4



3



12



1



Y



6



8



2



24



(ii)


















X



5



20



10



4



Y



20



5



10



25



(iii)


















X



4



3



6



1



Y



9



12



8



36



(iv)


















X



9



24



15



3



Y



8



3



4



25