'a' and 'b' are positive integers such that their LCM is 20 and their HCF is 1. What is the addition of the maximum and minimum possible values of 'a + b'?
Pick:
A) 28 B) 30 C) 22 D) 20 E) 32
possible values of a and b can be 5,4; 4,5 (which are same for a+b) and 1,20; 20,1 (same result for a+b)   so 21+9= 
<gadget id="calculator">21+9</gadget>
<output>30</output>
30. ans 30.
<result>B</result>
'a' and 'b' are positive integers such that their LCM is 20 and their HCF is 1. What is the addition of the maximum and minimum possible values of 'a + b'?