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The sum of two numbers is 15 and their product is 50. What is the sum of the reciprocals of these numbers.

A2/3

B4/11

C3/10

D5/9

Answer:

C. 3/10

Read Explanation:

Let the numbers be a and b a+b=15 ab=50 1/a + 1/b =a+b/ab = 15/50 = 3/10


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(1.75² - 0.25² )/ (1.75 - 0.25) = ?