Proportions
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Proportion says that two ratios (or fractions) are equal.
Example:
So 1-out-of-3 is equal to 2-out-of-6
The ratios are the same, so they are in proportion.
Example: Rope
A ropes length and weight are in proportion.
When 20m of rope weighs 1kg, then:
40m of that rope weighs 2kg
200m of that rope weighs 10kg
etc.
So:
201 = 402
Sizes
When...