For a basic monthly fee of F yen, Noako's first cell phone allowed him to use a maximum of 420 minutes on calls during the month. Then, for each of x additional minutes he used on calls, he was charged M yen, making his total charge for the month T yen, w : Crackverbal Support

For a basic monthly fee of F yen, Noako's first cell phone allowed him to use a maximum of 420 minutes on calls during the month. Then, for each of x additional minutes he used on calls, he was charged M yen, making his total charge for the Print

Modified on: Tue, 12 Oct, 2021 at 4:45 PM

Concept: The question tests on the application of basic arithmetic in a Word problem format.

Solution:

St (1)

Given – There is an additional 30 minutes of use (450-420=30) and

T = 13,755

Thus 13755 = F + 30 M

We do not know F and hence we cannot compute the value of M. (Insufficient)

St (2) - Given T= 13,125 and since used minutes is less than 420,the value of x=0 (additional minutes)

Hence 13125 = F + 0

F = 13125

However the value of M cannot be computed as x = 0. (Insufficient)

On combining both, we have

13755 = 13125 +30 M

M can be computed (Sufficient)

Hence option (C)

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For a basic monthly fee of F yen, Noako's first cell phone allowed him to use a maximum of 420 minutes on calls during the month. Then, for each of x additional minutes he used on calls, he was charged M yen, making his total charge for the Print

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