Which of the following can be the difference between number of calls made by R

Question

Which of the following can be the difference between number of calls made by Reynolds on Friday and Saturday?

Options:

A . 1

B . 2

C . 3

D . 4

Answer: Option D
:
D

The difference between number of calls made by Reynolds on Friday and Saturday = | (x-5)-(y+6) |

= |x-y-11|=|39-2y|

Because x=50-y

Now Robert made x+1 calls on Wednesday.

Therefore, x+1 $\leq$ 30 $\geq$ x $\leq$ 29

y $\geq$ 21

Thus 21 $\leq$ y $\leq$ 24 gives |39-2y|=3, 5, 7 or 9

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