There were P people in a room when a meeting started. Q people left the room during the first hour, while R people entered the room during the same time. What expression gives the number of people in the room after the first hour as a percentage of the number of people in the room who have been there since the meeting started?
- (P - Q)/(P - Q + R)
- 100 * (P - Q + R)/ (P - Q)
- (P + R)/ (P - Q)
- 100 * (P - Q)/(P - Q + R)
- 100 * (P + R)/(P - Q)
A charity solicited P persons over the phone who agreed to an average pledge of Rs.R each. Q of these people who had pledged an average of Rs. S each never sent in the pledged amount. Which of the following expressions represents the percentage of pledged money that the charity received?
- 100 * (PR/QS)
- 100 * (QS/PR)
- 100 (PR - QS)
- 100(1 - (QS/PR))
- 100 ( PR - (QS/PR))
A clothing manufacturer has determined that she can sell 100 suits a week at a selling price of Rs. 200 each. For each rise of Rs. 4 in the selling price she will sell 2 less suits a week. If she sells the suits for Rs. x each, how many rupees a week will she receive from the sales of the suits?
- x^{2 }/ 2
- 200- (x/2)
- 50x - x^{2 }/ 2
- 150x - x^{2 }/ 2
- 200x - x^{2 }/ 2
It costs Rs. x each to make the first thousand copies of a compact disk and Rs. y to make each subsequent copy. If z is greater than 1,000, how many Rupees will it cost to make z copies of the compact disk?
- 1,000 x + yz
- zx - zy
- 1,000 (z - x) + xy
- 1,000 (z - y) + xz
- 1,000 (x - y) + yz
Jack has three more cards than Bill. Together they have 47 cards. If x represents the number of cards Bill has, then an equation that can be used to determine the number of cards each one has is
- x + 3 = 47
- 2x + 3 = 47
- x - 3 = 47
- 2x - 3 = 47
- 3x + 3 = 47