If x + y = 60 , x > 0 , y > 0 , then the maximum value of `xy^3` is

If x+y=60, x, y gt 0 , then the maximum value of xy^(3) is-

If x+y=4, then maximum value of xy is

If x + y = 8, then the maximum value of xy is _______

If x + y=4 and x >=0, y>= 0 find the maximum value of x^3y .

If x+y=4 and x>=0,y>=0 find the maximum value of x^(3)y.

If 9x^2+y^2=37 and xy = 2 , x, y> 0 , then the value of (27x^3+y^3) is : यदि 9x^2+y^2=37 और xy = 2 , x, y> 0 , तो (27x^3+y^3) का मान ज्ञात कीजिए ।

If x+y le 2, x ge 0, y le 0 the point at which maximum value of 3x+2y attained will be