jjkkjjkk wrote:
Hey guys. Kinda having trouble answering these for SAT..
a.) If the average of four numbers is between 5 and 7, then the sum of the four numbers could be any one of the following except:
1.)20 1/2
2.)22
3.)25 1/2
4.)27
5.)29
Avg = Sum/(Total number of elements)
if Sum = 29 then Avg = 29/4 which is more than 7 so not possible.
So, Answer will be E
jjkkjjkk wrote:
b.) on average, 48 out of 100 families in a certain town own two cars. At this rate, how many out of 150 families do not own two cars?
100 -> 48
150 -> 48*150/100 = 72 families
jjkkjjkk wrote:
c.) In a grove, 8% of the apples picked are spoiled. On average,there will be 2 spoiled apples out of how many picked?
8% are spoiled
means out of 100: 8 apples are spoiled
or, 8 spoiled -> out of 100
so, 2 spoiled -> out of 2*100/8 = 25 apples
jjkkjjkk wrote:
d.)A store which formerly sold peppers at 3 pounds for $2.00 changed the price to 2 pounds for $1.50. If y is the percent increase in the price per pound, y=?
originally
3 pound for $2
so, 1 pound for (2/3)$
Now
2 pound for 1.5$
so, 1 pound for (1.5/2)$ = (3/4)$
Percentage increase = ((new price - old price)/old price)* 100
= ((3/4) - (2/3) /(2/3)) *100
= 12.50%
hope it helps!
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ankit
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