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A baseball team’s season consists of playing 162 games. At

Expert replies
by BTGmoderatorDC » Wed Dec 12, 2018 2:32 am

Timer

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Answers

A

B

C

D

E

Stats

Difficulty—

A baseball team's season consists of playing 162 games. At a certain point in its season, the team has won 55 percent of the games it has played. The team then wins a certain number of consecutive games so that at the end of the winning streak, the team has won 58 percent of the games it has played. How many wins did the team have at the end of its winning streak?

a. 10
b. 14
c. 42
d. 77
e. 87

OA E

Source: Princeton Review
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Source: — Problem Solving |

by GMATGuruNY » Wed Dec 12, 2018 3:40 am
BTGmoderatorDC wrote:A baseball team's season consists of playing 162 games. At a certain point in its season, the team has won 55 percent of the games it has played. The team then wins a certain number of consecutive games so that at the end of the winning streak, the team has won 58 percent of the games it has played. How many wins did the team have at the end of its winning streak?

a. 10
b. 14
c. 42
d. 77
e. 87
The team has won 58 percent of the games it has played.
58% = 58/100 = 29/50.
The fraction in blue implies that the number of wins must be a MULTIPLE OF 29:
If 50 games are played, the number of wins = (29/50)(50) = 29.
If 100 games are played, the number of wins = (29/50)(100) = 58.
If 150 games are played, the number of wins = (29/50)(150) = 87.
Of the five answer choices, only E is a multiple of 29.

The correct answer is E.
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We can try as follows:

by swerve » Wed Dec 12, 2018 9:32 am
We can try as follows:

Let w = games won
p = games played
w=0.58p ==> w=29p/50 ==> w/29=p/50
only 87, a multiple of 29, will make w an integer

Therefore, E
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by Scott@TargetTestPrep » Mon Mar 11, 2019 7:02 am
BTGmoderatorDC wrote:A baseball team's season consists of playing 162 games. At a certain point in its season, the team has won 55 percent of the games it has played. The team then wins a certain number of consecutive games so that at the end of the winning streak, the team has won 58 percent of the games it has played. How many wins did the team have at the end of its winning streak?

a. 10
b. 14
c. 42
d. 77
e. 87

OA E

Source: Princeton Review
We can let n = the number of games they played prior to the winning streak and w = the number games they won during the winning streak. We can create the following equation:

(0.55n + w)/(n + w) = 0.58

0.55n + w = 0.58n + 0.58w

0.42w = 0.03n

42w = 3n

14w = n

From the above, we see that n is a multiple of 14. Furthermore, since 0.55n = 11/20 x n = 11n/20 is a whole number, we see that n is a multiple of 20. A multiple of 20 that is also a multiple of 14 is their LCM, which is 140 (the next common multiple is 280, but that is greater than 182 already). Therefore, n must be 140 and w must be 10. So the number of games they won at the end of their winning streak was 0.55 x 140 + 10 = 77 + 10 = 87.

Alternate Solution:

We know that the number of games played and the number of games won at the end of the winning streak both need to be whole numbers. If we let n equal the total number of games played at the end of the winning streak, then 0.58n, or 58n/100 = 29n/50 must be a whole number. Notice that 29 and 50 have no common factors and 29n/50 is the number of games won at the end of the winning streak; therefore, the number of games won at the end of the winning streak must be a multiple of 29. Among the choices, only 87 = 29 x 3 is a multiple of 29; therefore, it is the correct answer.

Answer: E

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