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An Internet supplier has 4 international cables. Each cable

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An Internet supplier has 4 international cables. Each cable

by AAPL » Tue Aug 28, 2018 5:38 am

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An Internet supplier has 4 international cables. Each cable contains 4 sub-cables, which in turn are composed of 4 intertwined copper wires. Each cable is color - coded differently - cyan, indigo, magenta, sapphire.

What was the average communication transfer rate per international cable last month?

(1) The sub-cables in the cyan and indigo cables transferred 48 Gigabytes of information last month.
(2) The sub-cables in the indigo and sapphire cables transferred 26 Gigabytes of information last month.

OA E.
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An Internet supplier has 4 international cables. Each cable

by fskilnik@GMATH » Tue Aug 28, 2018 10:44 am

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AAPL wrote: An Internet supplier has 4 international cables. Each cable contains 4 sub-cables, which in turn are composed of 4 intertwined copper wires. Each cable is color - coded differently - cyan, indigo, magenta, sapphire.

What was the average communication transfer rate per international cable last month?

(1) The sub-cables in the cyan and indigo cables transferred 48 Gigabytes of information last month.
(2) The sub-cables in the indigo and sapphire cables transferred 26 Gigabytes of information last month.
The answer is (E) immediately: "nothing is known about the magenta cables"

Let´s explain the argument in a proper (more formal, less intuitive-based way):

Imagine all cyan, indigo and sapphire cables fixed, with last month transference of information all satisfying both statements given (this is possible because it is an examiner´s burden).

In that situation:

If all sub-cables in the magenta cables transfer 0 Gigabytes of information last month, we will get a certain average.
If all sub-cables in the magenta cables transfer (say) 1 Gigabytes of information last month, we will get another average.

The above follows the notations and rationale taught in the GMATH method.
Fabio Skilnik :: GMATH method creator ( Math for the GMAT)
English-speakers :: https://www.gmath.net
Portuguese-speakers :: https://www.gmath.com.br
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