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Math Help - Pre-Algebra

  1. #1
    Newbie
    Joined
    Feb 2009
    Posts
    1

    Pre-Algebra

    1. If Lynn can type a page in p minutes, what piece of the page can she do in 5 minutes?
    A. 5/p 
B. p - 5 
C. p + 5 
D. p/5 
E. 1- p + 5

    2. If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?
    A. 2 hours and 24 minutes 
B. 3 hours and 12 minutes 
C. 3 hours and 44 minutes 
D. 4 hours and 10 minutes 
E. 4 hours and 33 minutes

    3. Employees of a discount appliance store receive an additional 20% off of the lowest price on an item. If an employee purchases a dishwasher during a 15% off sale, how much will he pay if the dishwasher originally cost $450?
    A. $280.90 
B. $287 
C. $292.50 
D. $306 
E. $333.89
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  2. #2
    Senior Member
    Joined
    Nov 2007
    Posts
    329
    1A
    2A (Sally 1 hour: \frac 14 house; John 1 hour: \frac 16 house therefore Sally+John 1 hour \frac 14+\frac 16=\frac 5{12} house so they can paint 1 house in \frac {12}5 hour which is A)
    3D ( 450\cdot 0.85\cdot 0.8)
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