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If Lindsay & Joseph paint the entire room in 1 hour and lindsay paints 1/x part of room, than Joseph paints (x-1)/x part in one hour. In 20 min or 1/3 (20/60) hour it paints (x-1)/3x part of the room.
- by raul_200435
Sat Aug 17, 2013 10:52 pm- Forum: Problem Solving
- Topic: Lindsay can paint:
- Replies: 5
- Views: 1677
There is another way to it also, Remember, the formulae for sum of consecutive even numbers is n(n+1) eg: sum of 2,4,6,8,10 (which are five consecutive even number is n=((2+10)/2))-1)=5, where 2 is the first number in the series & 10 is the last number therefore n(n+1)=5*(5+1)=30) Apply the form...
- by raul_200435
Tue Jul 06, 2010 9:17 pm- Forum: Problem Solving
- Topic: Help - Problem Solving Question! sitting GMAT soon
- Replies: 4
- Views: 1638