# Problem Solving - Percent

by Mary
(Brooklyn, New york )

1- On friday and saturday, there were a total of 200 cars in the parking lot of a movie theater. On friday, 120 cars were in the parking lot.
a. What percent of the total number of cars were in the parking lot on friday? show work
b. what percent of total numbers of cars were in teh parking lot on saturday? show work

2- charles stores his baseball cards in a container like the one shown below.

I am not able to attach the diagram but it's height is 5 in. lenght is 9 in. and width is 3 in.

a. what is the volume, in cubic inches, of the container? show work

3- christina scored a certain number of goals, g, during a soccer season. Sarah scored twice as many goals during the same season.

a.Write an expression for the nubmer of goals sarah scored.
b. explain how you determined your expression.

4- JOrdan has a bag that contains 246 marbles. There are 51 brown marbles adn 195 gray marbles.

a. Estimate teh percent of brown marbles in the bag.

use words, symbols, or nubmer to explain how to esitmate the percent of brown marbles in the bag.

b. Jordan adds 12 red marbles to the bag. Estimate the percent of marbles in teh bag that are red. show work

5- The name jalen is writeen on a piece of paper. The paper is then ripped into 5 pieces, with each piece having a letter on it. Answer the following question about prbability:
a) P("A")= b) P(VOWEL)= C) P(NOT A VOWEL)=

D)What percent of the time woud you expect to randomly choose the letter "L"?
E)What percent of the time would you expect to randomly choose the letter "J" or"E"?

6- Leon uses the digits 5, 9, and 7 to creat as many 3-digit numbers. Each number is written on a piece of paper and puit into a hat.
a. what's the probability of randomly selecting a nubme rthat begins with the digit 9?
b. wht's percent of the time would you expect to choose a number that starts with eithe ra 5 or 9?

7- Mr. Rosenberg has a container of 80 pencils in his drawer. Half of the pencils are wooden. Out of the menchanical pencils, 20 are red, 10 are blue, adn 10 are green.
a. If Mr. Rosenberg randomly takes a pencil out of the container, what is the probability that the pencil will be wooden? Explain how you got your answer.

b. If Mr. Rosenberg randomly takes a pencil out of the container, what is teh probability that the pencil will be blue or green? Explain how you got your answer.

Thank you so much for you help. I would really appreciate it.

### Comments for Problem Solving - Percent

 May 12, 2011 Problem Solving – Percent - Probability by: Staff ------------------------------------------ Part IV d) What percent of the time would you expect to randomly choose the letter "L"? P("L") = (number of times the “L” appears in the name)/(total number of letters in the name) P("L") = (1)/(5) P("L") = 1/5 To convert the fraction to a %, multiply by 100 P("L") = (1/5)*100 P("L") = 100/5 P("L") = 20% The final answer to Problem 5, Part d is: 20% e) What percent of the time would you expect to randomly choose the letter "J" or "E"? P("J or E") = (number of times the “J” + number of times “E” appears in the name)/(total number of letters in the name) P("J or E ") = (1 + 1)/(5) P("J or E ") = (2)/(5) P("J or E ") = 2/5 To convert the fraction to a %, multiply by 100 P("J or E ") = (2/5)*100 P("J or E ") = 200/5 P("J or E ") = 40% The final answer to Problem 5, Part e is: 40% 6- Leon uses the digits 5, 9, and 7 to create as many 3-digit numbers. Each number is written on a piece of paper and put into a hat. a. What's the probability of randomly selecting a number that begins with the digit 9? P("9") = (number of times the “9” appears within the three digits)/(total number of digits) P("9") = (1)/(3) P("9") = 1/3 The final answer to Problem 6, Part a is: 1/3 b. What percent of the time would you expect to choose a number that starts with either a 5 or 9? P("5 or 9") = (number of times the “5” + number of times “9” is written)/(total number of digits) P("5 or 9") = (1 + 1)/(3) P("5 or 9") = (2)/(3) P("5 or 9") = 2/3 To convert the fraction to a %, multiply by 100 P("5 or 9") = (2/3)*100 P("5 or 9") = 200/3 P("5 or 9") = 66.7% The final answer to Problem 6, Part b is: 66.7% 7- Mr. Rosenberg has a container of 80 pencils in his drawer. Half of the pencils are wooden. Out of the mechanical pencils, 20 are red, 10 are blue, and 10 are green. a. If Mr. Rosenberg randomly takes a pencil out of the container, what is the probability that the pencil will be wooden? Explain how you got your answer. P("wooden") = (number of wooden pencils)/(total number of pencils) P("wooden") = (40)/(80) P("wooden") = 1/2 The final answer to Problem 7, Part a is: 1/2 b. If Mr. Rosenberg randomly takes a pencil out of the container, what is the probability that the pencil will be blue or green? Explain how you got your answer. P("blue or green") = (number of “blue” pencils + number of “green” pencils)/(total number of pencils) P("blue or green") = (10 + 10)/(80) P("blue or green") = (20)/(80) P("blue or green") = 1/4 The final answer to Problem 7, Part b is: 1/4 Thanks for writing. Staff www.solving-math-problems.com