If 12 pumps can empty a reservoir in 20 hours, then time required
by 45 such pumps to empty the same reservoir is ______ hours.
Two quantities are said to vary ______ with each other if an increase
in one causes a decrease in the other in such a manner that the
product of their corresponding values remains constant.
Two quantities are said to vary ______ with each other if they increase
(decrease) together in such a manner that the ratio of their
corresponding values remains constant
x and y are said to vary directly with each other if for some positive
number k, ______ =k
Both x and y are said to vary ______ with each other if for some
positive number k, xy = k.
When two quantities x and y are in _______ proportion or vary ______
they are written as x ∝ 1/ y.
When two quantities x and y are in ______ proportion or vary ______
they are written as x ∝ y.
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