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In a proportion, the sum of the two external terms is 37 and the difference is 13. The ratio of the two ratios in this proportion is 12 / 5. Please write down the proportion formula
25：125/12=144/5：12
For a formula, the sum of two external terms is 37, the difference is 13, and the ratio of the two ratios is 12 / 5
The external items are as follows:
（37＋13）÷2＝25
37－25＝12
therefore
The proportion formula is
12:5＝60:25
Can 1 / 2, 1 / 3, 1 / 6 and 1 / 4 make up the proportion? What proportion?
1 / 2:1 / 4 = 1 / 3:1 / 6 1 / 2:1 / 3 = 1 / 4:1 / 6 or vice versa! There are four groups, eight groups are wrong!
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