Hi,

Difficulty level: 600

To find the time duration of Wanda's call,

Using (1),

Total charge for the call = $6.5, we neither know the number of minutes nor call charges. Insufficient.

Using (2),

Wanda was charged $0.50 more for the first minute of the telephone call than for each minute after the first.

x+0.5 for first minute,

for second minute x, & so on,

for the whole call total charges would be nx+0.5 (n = number of minutes)

or nx+0.5 = 6.5

or nx = 6 (1*6 or 6*1 or 2*3 or 3*2)

thus, (n,x) = (1,6) or (6,1) or ....

which means, for 1 min $6 can be charged.

or for 6 mins $1 can be charged. Insufficient.

Answer is (E),

Regards,

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