ratio and percentage any 5 point
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Answer:
Ratio
1.1 Introduction
Ratios crop up often in official statistics. The government wants the teacher-pupil ratio in schools to be increased to one teacher to thirty pupils or less. The birth rate has fallen: the ratio of children to women of childbearing age has gone down. It used to be 2.4 to 1, and now it is 1.9 to 1. Predictions for the ratio of working adults to retired adults are disturbing. Predictions are, that by 2030 the ratio will be two working adults to every retired person, instead of three to one now, and four to one ten years ago.
Often ratios are implicit in the language rather than explicitly referred to: one teacher for 30 pupils; 2.4 children per woman of childbearing age; one retired person per two working adults. The word ‘per’ often indicates that the concept of ratio is being used.
What are percentages?
Percentages are used, particularly in newspaper articles, to indicate fractions (as in ‘64% of the population voted’) or to indicate changes (as in ‘an increase of 4%’).
Percentages often indicate proportions. For example, labels in clothes indicate the various proportions of different yarns in the fabric. ‘Percent’ means ‘per hundred’ and is denoted by the symbol %. 100% is the same as the whole or one hundred per hundred.
100% cotton indicates that the fabric is made entirely from cotton. (100 parts out of 100 parts).
60% cotton means that (or 0.6) of the fabric is cotton.
40% polyester means that (or 0.4) is polyester.
The percentages on the label should total 100%, just as the corresponding fractions add up to 1, because the total (100%) refers to the whole garment. 60% + 40% = 100%, 0.6 + 0.4 = 1.
Percentages can also be manipulated as either fractions or decimals.
Step-by-step explanation:
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