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Q.

If (x−2y5y6a−2b)=5  (42b56)  then  a+x=

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a

42

b

24

c

60

d

66

answer is D.

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Detailed Solution

x−2y=20 5y=10 ⇒  y=2  x=24  b=6⇒a−2b=30 ∴a=42∴x+a=24+42=66
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