There are some red and green beads in a container. If 75 more green beads are put into the container, the percentage of red beads will decrease from 30% to 20%. How many red beads are in the container?
Solution
12 units ----- 7 units + 75
5 units ----- 75
1 unit ----- 75 divided by 5 = 15
Red at first
3 units ----- 3 x 15 = 45
Answer: 45 red beads
Wednesday, September 16, 2009
Raffles Girls Pri Sch 2007 PSLE Math Prelim Q43
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