Example 1 A chemist makes a paste that is ^r table 1 2 salt (NaCI), y sugar (C6H12O6), and the rest water

(H2O).How much of the paste is a solid?

Step 1 Find the LCD of the fractions.

Step 2 Rename each numerator and each denominator with the LCD.

Step 3 Add the numerators.

rr of the paste is a solid.

Example 2 The average precipitation in Grand Junction,CO,is j7j inch in November,and JJ inch in December.What is the total average precipitation? Step 1 Find the LCD of the fractions. j7J + ir (LCD, 10)

Step 2 Rename each numerator and each denominator with the LCD. 7 X 1 = 7, 10 X 1 = 10 3 X 2 = 6, 5 X 2 = 10

Step 3 Add the numerators.

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