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direct proportion indirect proportion additive proportion partitive proportion
50 percent.
a proportion that is open
Take the amount shown by the percentage as the left number in the proportion. 100 minus that amount is the right number in the proportion. This can then be simplified by identifying any common factors in the two numbers. For instance 40% would be written down as 40:60. This could then be simplified to 2:3.
Inverse is the opposite of proportion