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Changing Scale (Including Flags)

If a:b:c=3:...

Question

If $a : b : c = 3 : 4 : 7$ , then the ratio $(a + b + c) : c$ is equal to

A

14 : 3

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B

7 : 2

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C

1 : 2

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D

2 : 1

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Solution

The correct option is C $2 : 1$
Let $a = 3 K, b = 4 K, c = 7 K$

then,

$\frac{a + b + c}{c} = \frac{3 K + 4 K + 7 K}{7 K} = \frac{14 K}{7 K} = 2$

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