Q66 of 106 Page 310

If x varies inversely as y and y = 60 when x = 1.5, find x when y = 4.5.

If x varies inversely as y


∴ xy = k (constant)


If x = 1.5 and y = 60


∴


⇒ k = 90


When y = 4.5, then from Eq.(i),


45× y = k


⇒ 45 × y = 90


⇒ 20


More from this chapter

All 106 →
64

The variable x varies directly as y and x = 80 when y = 160, What is y when x is 64.

 65

l varies directly as m and l is equal to 5, when , find l when .

 67

In a camp, there is enough flour for 300 persons for 42 days. How long will the flour last if 20 more persons join the camp?

 68

A contractor undertook a contract to complete a part of a stadium in 9 months with a team of 560 persons. Later on, it was required to complete the job in 5 months. How many extra persons should he employ to complete the work?