Given, F = 2E + 4Y ...(I)
√EY = 4√3
⇒ EY = 48 ...(II)
and 2EY/ E + Y = 6 ⇒ E + Y = 16 ...(III)
Now, (E -Y)2 = (E + Y)2 - 4EY
= (16)2 - 4 x 48
= 256 - 192 = 64
∴ E - Y = 8 ...(iv)
From Eqs. (iii) and (iv), we get
E = 12 and Y = 4
From Eq. (i) F = 2 x 12 + 4 x 4 = 40 yr
