How many calls did Victor make on Friday?
As each student made a total of 150 calls
x + y = 150-(27+18+26+29)
x + y = 50.
From Victor’s statement calls made by Victor on Friday= (x+y)2 =25
Calls made by Robert on Saturday = 150– 24-x-1-y-30-28 = 17
Calls made by Reynolds on Tuesday = 150-(23+30+27+y+6+x-5)=19
Calls made by Sam on Monday = 150 – (23+x+y+4+27 +24)=22
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