Sum of two numbers prime to each other is 15 and their L.C.M. is 56. What are the numbers? Choose the correct answer.
A) 9 and 8  B) 5 and 10  C) 7 and 9  D) 7 and 8  E) 10 and 8
As two numbers are prime, only options satisfy ie option A and 7 and 8 and C   but option 7 and 8 will make the product of numbers i.e 56   ANSWER:7 and 8
<result>D</result>
Sum of two numbers prime to each other is 15 and their L.C.M. is 56. What are the numbers?