If x : y = 3 : 4, the value of x2y + xy2 : x3 + y3 is
  • a)
    13 : 12
  • b)
    12 : 13
  • c)
    21 : 31
  • d)
    none of these
Correct answer is option 'B'. Can you explain this answer?

CA Foundation Question

5 Answers
Tanishq Singhal answered Jun 18, 2018
Answer is (b) because when we put the value on given equation so we get 84:91 so it is divisible by 7 and we get 12:13

Dinesh Kukreja answered Nov 27, 2018
ii) From the given data, we have x = (3/4)y or 4x = 3y 

iii) (x2y + xy2) :: (x2 + y2) = xy(x + y)/{(x + y)(x2 - xy + y2) = (xy)/(x2 - xy + y2) 
Substituting x = (3/4)y from the above, 
(x2y + xy2) :: (x2 + y2) = (3y2/4)/(9y2/16 - 3y2/4 + y2) = 12/(9 - 12 + 16) = 12/13 

Pratik Gobarbhai answered Oct 24, 2018
Frist x=3 and y=4 36+48:27+6484:9112:13

Rita Maske answered Oct 04, 2019
Put the value of x and y

3*3*4+3*4*4/3*3*3+4*4*4

36+48/27+64

84/91

12/13 are the divisible by 7

Akshay Abraham answered Mar 15, 2019
3^2(4)+3(4)^2 : 3^3+4^3
9(4)+3(16) : 27+64
38+48/91
84/91
=12:13

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