At first, the total number of sheep in Farm A and Farm B was 980. After 3/5 of the sheep in Farm A and 200 of the sheep in Farm B are sold, the ratio of the number of sheep in Farm A to Farm B becomes 1 : 4.
a) Find the number of sheep in Farm B at first.
b) Find the total number of sheep left in Farm A and Farm B.
Solution
13 units ----- 980 – 200 = 780
1 unit ----- 780 divided by 13 = 60
a) Number of sheep in Farm B at first -----
8 units + 200 ----- (8 x 60) + 200 = 680
Answer: There were 680 sheep in Farm B at first.
b) Total number of sheep left in Farm A and Farm B -----
10 units ----- 10 x 60 = 600
Answer: There were 600 sheep left in both farms.
Monday, July 21, 2008
Henry Park Pri Sch 2007 PSLE Math Prelim Q42
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