It is given that the ratio of the number of marbles owned by Susan to the number of marbles owned by Teresa is 5:2 . Suppose Susan has n marbles.
(a)Find the number of marbles owned by Teresa in terms of n.
(b) If Susan gives 18 of her own marbles to Teresa, both of them will have the same number of marbles. Find n.
Form 2 Maths
2012-02-01 10:51 pm
回答 (1)
2012-02-02 2:18 am
✔ 最佳答案
a)Let T be the number of marbles owned by Teresa , thenn : T = 5 : 2n / T = 5 / 2
5T = 2n
T = (2/5)nSo Teresa have (2/5)n marbles.
b)If Susan gives 18 of her own marbles to Teresa , then
Susan have n - 18 marbles while Teresa have (2/5)n + 18 marbles .So
n - 18 = (2/5)n + 18
n - (2/5)n = 36
(3/5)n = 36
n = 60
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