CA Foundation Exam  >  CA Foundation Questions  >  a)(2, 5)b)(5, 2)c)(2, 7)d)(3, 4)Correct answe... Start Learning for Free
  • a)
    (2, 5)
  • b)
    (5, 2)
  • c)
    (2, 7)
  • d)
    (3, 4)
Correct answer is option 'A'. Can you explain this answer?
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a)(2, 5)b)(5, 2)c)(2, 7)d)(3, 4)Correct answer is option 'A'. Can you ...
ANSWER :- a
Solution :- 4/x - 5/y = (x+y)/ xy + 3/10
Taking L.C.M
(4y-5x)/ xy = (10x+10y+3xy) / 10xy
Cancelling both the 'xy's in the denominators
4y-5x = (10x+10y+3xy)/10
Cross multiplying, we get
40y-50x = 10x+10y+3xy
10x+10y+3xy-40y+50x=0
60x-30y+3xy=0....................... equation (1)
Equation (2)  3xy= 10(y-x)
3xy=10y-10x
-10x+10y-3xy = 0 .................. equation (2)
Solving both the following simplified equations
 60x-30y+3xy =0...............(a)
-10x+10y -3xy = 0..............(b)
(a) + (b)
50x - 20y = 0
50x = 20y
x/y = 20/50
x : y :: 2:5
x=2 & y=5
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a)(2, 5)b)(5, 2)c)(2, 7)d)(3, 4)Correct answer is option 'A'. Can you ...
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a)(2, 5)b)(5, 2)c)(2, 7)d)(3, 4)Correct answer is option 'A'. Can you ...
ANSWER :- a
Solution :- 4/x - 5/y = (x+y)/ xy + 3/10
Taking L.C.M
(4y-5x)/ xy = (10x+10y+3xy) / 10xy
Cancelling both the 'xy's in the denominators
4y-5x = (10x+10y+3xy)/10
Cross multiplying, we get
40y-50x = 10x+10y+3xy
10x+10y+3xy-40y+50x=0
60x-30y+3xy=0....................... equation (1)
Equation (2)  3xy= 10(y-x)
3xy=10y-10x
-10x+10y-3xy = 0 .................. equation (2)
Solving both the following simplified equations
 60x-30y+3xy =0...............(a)
-10x+10y -3xy = 0..............(b)
(a) + (b)
50x - 20y = 0
50x = 20y
x/y = 20/50
x : y :: 2:5
x=2 & y=5
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a)(2, 5)b)(5, 2)c)(2, 7)d)(3, 4)Correct answer is option 'A'. Can you explain this answer?
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