Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is :  Choose one:
A) 81  B) 82  C) 85  D) 90  E) 95
Since the numbers are co-prime, they contain only 1 as the common factor.   Also, the given two products have the middle number in common.   So, middle number = H.C.F of 551 and 1073 = 29;   First number = 551/29= 
<gadget id="calculator">551/29</gadget>
<output>19</output>
19   Third number= 1073/29= 
<gadget id="calculator">1073/29</gadget>
<output>37</output>
37.   Required sum= 19 + 29 + 37= 
<gadget id="calculator">19 + 29 + 37</gadget>
<output>85</output>
85.   ANSWER:85
<result>C</result>
Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is :