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

You must Believe

GMAT Quant Tutor

How to start GMAT preparations?

How to Improve Quant Score?

Gmatclub Topic Tags

Check out my GMAT debrief

Quant Formula Sheet

How to Solve :

Statistics || Reflection of a line || Remainder Problems || Inequalities