A bag contains 45 marbles of various colors. Lena draws 48 times, each time replacing the marble before drawing again. She gets a total of 16 red marbles.

Which is best prediction of how many red marbles are in the bag?

A.
3

B.
13

C.
15

D.
16
plz help i am on a test

Question

A bag contains 45 marbles of various colors. Lena draws 48 times, each time replacing the marble before drawing again. She gets a total of 16 red marbles.

Which is best prediction of how many red marbles are in the bag?
 
 A.
3
 
 B.
13
 
 C.
15
 
 D.
16
 plz help i am on a test

anonymous · Answer

can anyone plz help

dumbcow · Answer

use a proportion
$$\frac{R}{45} = \frac{16}{48}$$

anonymous · Answer

thats the thing i dont get it

dumbcow · Answer

btw dont say you are on a test....that would imply you are cheating:{

anonymous · Answer

ok

dumbcow · Answer

solve proportions by reducing the fraction 
16/48 = 1/3

anonymous · Answer

ok

dumbcow · Answer

get "r" by itself by multiplying both sides by 45

anonymous · Answer

so 16 time 45 and 49 time 45

dumbcow · Answer

hmm...
16/48 = 1/3   .... 16*3 = 48 right?

dumbcow · Answer

$$\frac{R}{45} = \frac{1}{3}$$
$$\frac{45}{45} R = \frac{45}{3}$$
R = 45/3