A) 70
B) 77
C) 63
D) 56
Correct Answer: C
Solution :
Let the numbers be 7x and 7y where x and y are co-prime. Now, LCM of 7 x and \[7y=7\,xy\] \[\therefore \] \[7xy=140\] \[\Rightarrow \] \[xy=\frac{140}{7}=20\] Now, required values of x and y whose product is 50 and are co-prime, will be 4 and 5. \[\therefore \] Numbers are 28 and 35 which lie between 20 and 45. \[\therefore \] Required sum \[=28+35=63\]You need to login to perform this action.
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