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| Definition of ratio |
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If a and b are two quantities with the same units such that  ; then  |
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| Ratio does not have any unit. |
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| The quantities a and b are called terms of the ratio. |
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| a' is called antecedent (first term) |
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| b' is called consequent (second term) |
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| A ratio is always expressed in its lowest terms. |
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| Examples: |
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| a) Ratio of 20 boys to 15 girls. |
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| Ratio of boys to girls =4:3 |
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| b) Ratio of Rs.50 to Rs.75 |
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| c) Ratio of 4m to 160cm |
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| The value of a ratio remains the same if both the antecedent and the consequent are multiplied or divided by the same non-zero quantity. |
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