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Standard VII
Mathematics
Fibonacci Series
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Question
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What least number must be subtracted from each term of the ratio 15 : 19 to make the ratio 3 : 4?
(a) 3
(b) 5
(c) 6
(d) 9
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Solution
(a) 3
Suppose that the number to be subtracted is x.
Then, (15 − x) : (19 − x) = 3 : 4
⇒
15
-
x
19
-
x
=
3
4
⇒
6
0
-
4
x
=
57
-
3
x
⇒
x
=
3
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