[考試] 請教三題計量
1.The ratio, by volume, of soap to alcohol to water in a certain solution
is 2:50:100. The solution will be altered so that the ratio of soap to
alcohol is doubled while the ratio of soap to water is halved. If the
altered solution will contain 100 cubic centimeters of alcohol, how many
cubic centimeters of water will it contain?
Ans:800
2.A store currently charges the same price for each towel that it sells.
If the current price of each towel were to be increased by $1, 10 fewer
of the towels could be bought for $120, excluding sales tax. What is the
current price of each towel?
Ans:$3
3.A circular rim 28 inches in diameter rotates the same number of inches
per second as a circular rim 35 inches in diameter. If the smaller rim
makes x revolutions per second, how many revolutions per minute does the
large rim make in terms of x?
Ans:48x
我題目看不太懂.如果有人有空.麻煩跟我解釋一下~~感謝^^~~~
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