Q2 of 54 Page 162

If x and y are directly proportional, find the value of x1, x2 and y2 in the table given below:

















X



3



x1,



x2



10



Y



72



120



192



y2


We use the relation Here x1 = 5, y1 = 210 and x2 = 2


Here,


⇒ x1 × 72 = 3 × 120


⇒ x1 = = 5


Now,


⇒ x2 × 72 = 3 × 192


⇒ x2 = = 8


And


⇒ y2 × 3 = 10 × 72


⇒ y2 = = 240


More from this chapter

All 54 →
1

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

(i)




















x



3



5



8



11



26



y



9



15



24



33



78



(ii)




















x



2.5



4



7.5



10



14



y



10



16



30



40



42



(iii)






















x



5



7



9



15



18



25



y



15



21



27



60



72



75


 3

If truck covers a distance of 510 km in 34 litres of diesel. How much distance would it cover in 20 litres of diesel?

 4

A taxi charges a fare of Rs.2550 for journey of 150 km. How much would it charge for a journey of 124 km?

 5

A loaded truck covers 16 km in 25 minutes. At the same speed, how far can it travel in 5 hours?