The correct options are
A 1:4
B 4:1
Let the numbers are a and b, so
H.M.=2aba+b
G.M.=√ab
Given, H.M.:G.M.=4:5
⇒2aba+b√ab=45
⇒2√aba+b=45
⇒2(a+b)=5√ab
Squaring both the sides
4(a2+2ab+b2)=25ab
⇒4a2−16ab+4b2=0
⇒(a−4b)(4a−b)=0
⇒ab=4,14
Hence, the correct answer is option (A) and (B).