If √45 +√125 = 17.89, then what will be the value of √180 +√80 ?
(Give your answer to one decimal place.)

Correct option is C

Given:
√45 +√125 = 17.89
Solution:
√45 +√125 = 17.89
=> 3√5 + 5√5 = 17.89
=> 8√5 = 17.89
Now solve

√180 +√80
=> 6√5 + 4√5 = 10√5
=> 10√5 = 17.89 × (10√5/8√5)
=> 10√5 = 17.89 × (5/4)
=> 10√5 = 22.4