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!

_________________

Ankit

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