Q15 of 54 Page 162

Reenu type 540 words during half an hour. How many words would she type in 8 minutes?

More the time, more will be the no. of words typed. So it is a direct proportion.


Half an hour = 30 minutes


Let the no. of words be x,


⇒ 30 × x = 540 × 8


⇒ x = = 144 words


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Observe the tables given below and in each case find whether x and y are inversely proportional:

(i)


















X



6



10



14



16



Y



9



15



21



24



(ii)




















X



5



9



15



3



45



Y



18



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6



30



2



(iii)


















X



9



3



6



36



Y



4



12



9



1


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If x and y are inversely proportional, find the values of x1, x2, y1 and y2 in the table given below:



















X



8



x1



16



x2



80



Y



y1



4



5



2



y2