**AVERAGE**

**Formulae:**

1.Average=Sum of
quantities/Number of quantities.

2.Suppose a man covers a
certain distance at x kmph and an equal distance at y kmph, then the average
speed during the whole journey is (2xy/x+y) kmph.

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To solve problems regarding average....click here

**RATIO AND PROPORTION**

**Ratio**

Ratio is a comparison of two quantities of the same kind.

It shows the number of times one quantity contains another quantity.

The ratio of two quantities is equivalent to the fraction that one quantity is of the other.

The ratio of "a" to "b" is written as a: b, read as "a is to b\ and is equal to a/b.

In the ratio a: b, 'a' and 'b" are called the terms of the ratio.

‘a’ is called the first term (antecedent) and

^{L}b" is called the second term (consequent).**Note: –**

o The ratio is an abstract number.

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