Bunuel
In a fruit store, apples are priced at $4 per pound and oranges at $6 per pound. Was the total weight of apples sold more than the total weight of oranges sold?
(1) The average (arithmetic mean) price per pound of the fruit sold is less than $5.
(2) The total weight of all the fruit sold is 10 pounds.
Sol:
Option-AApples are priced at $4 per pound and Oranges at $6 per pound;
Let, A be the weight of apples sold in pounds and O be the weight of oranges sold in pounds;
Asked: Is A > O
St-1:The average (arithmetic mean) price per pound of the fruit sold is less than $5.
Average (arithmetic mean) price per pound of the fruit sold = Total amount of fruits sold in Dollar / Total weight in Pounds < 5
===> (4*A + 6*O) / (A + O) < 5
4*A/(A+O) + 6*O/(A+O) < 5
If A had been equal to O , the average would have been 5 as A/(A+O) = O/(A+O) = 1/2
As the average is below the midpoint of 4 & 6, ==> weightage of A is more than O ; Hence, A > O
Statement is SufficientSt-2:The total weight of all the fruit sold is 10 pounds.
A + O = 10
This statement is clearly Insufficient