In our example, we are asked to use the rate
of five machines to find out the rate of two machines. Once we determine
this rate, we can then figure out how much time is needed for two machines
to complete part of the job.
On the surface, this is a tricky question. But
what makes it tricky? The change in the number of machines complicates
this problem. How are we to work with two rates that are based on different
numbers of machines and different parts of the job?
The answer: use logic and quick calculation
to find the correct answer. In this question, the new number of machines
is a proportion of the old number of machines. By recognizing and working
with this key relationship, we will be able to get to the correct answer
quite easily.
Let's see how this works.
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Video Lessons and 10 Fully Explained Grand Tests
Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.