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Primary school mathematics Huanggang small champion sixth grade page 68 6 big questions (2) How to make a small problem?
The same simplest fraction sum of two molecules is 1 and 18, and the ratio of the two denominators is 2: 3. What are these two scores?
Solution: Let denominators be 2a and 3a respectively.
therefore
1/(2a)+ 1/(3a)= 25/ 18
5/(6a)=25/ 18
a=3/5
Then these two scores are 5/6 and 5/9 respectively.