Home » Aptitude » Algebra » Question
  1. If (3x – 2y) : (2x + 3y) = 5 : 6, then one of the values of
    ³√x + ³√y
    2 is
    ³√x - ³√y

    1. 1
      5

    2. 5
    3. 25
    4. 1
      25

Correct Option: C

3x - 2y
=
5
3x - 2y6

⇒ 18x – 12y = 10x +15y
⇒ 18x – 10x = 12y + 15y
⇒ 8x = 27y
x
=
27
y8

On taking cube root of both sides,
³√x
=
³√27
=
3
³√y³√82

By componendo and dividendo,
³√x + ³√y
=
3 + 2
=
5
³√x - ³√y3 - 21

On squaring both sides,
³√x + ³√y
2 = 5 × 5 = 25
³√x - ³√y



Your comments will be displayed only after manual approval.