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In a certain town 25% families own a cel...

In a certain town 25% families own a cellphone, 15% families own a scooter and 65% families own neither a cellphone nor a scooter. If 500 families own both a cellphone and scooter, then total umber of families in the town is

A

10000

B

20000

C

30000

D

40000

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The correct Answer is:
A
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OBJECTIVE RD SHARMA-SETS-Exercise
  1. Let Z be the set of all integers and A={(a,b):a^(2)+3b^(2)=28 ...

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  2. In a class of 35 students , 17 have taken Mathematics , 10 have ta...

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  3. if A={(x,y):y=(4)/(x),xne0}and B= {(x,y):x^(2)+y^(2)=8,x,yin R},t...

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  4. if A={x:x is multiple of 4} and B= {x:x is a multiple of 6}, t...

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  5. if A={(x,y):x^(2)+y^(2)=4,x,y in R } and B={(x,y): x^(2)+y^(2)= 9,x,...

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  6. if A={(x,y):x^(2)+y^(2)=4, x,y in R }and B={(x,y):Y=|x|, x , y in ...

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  7. if A={theta: cos theta gt -(1)/(2),0 le theta le pi }and B={theta...

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  8. in rule method the null set is resresented by

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  9. if A and B are two given sets , then A cap (A capB) ^( C) is equal ...

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  10. Let n(Li) = 700 ,n(A) = 200,n( B) =300 and n(A cap B)=100 then n(A^( ...

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  11. if A ={x:x is a multiple of 3 } and , B={x:x is a multiple of 5 }...

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  12. For any three sets A1,A2, A3, let B1=A1, B2 = A2-A1 and B3 = A3-(A1uuA...

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  13. In a city 20% of the population travels by car, 50% by bus and 10% tra...

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  14. An investigator interviewed 100 students to determine the performan...

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  15. two finite sets have m and n elements . The total number of subs...

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  16. In a class of 175 students the following data shows the number of stu...

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  17. if A={1,2,3,4,5},B={2,4,6}and C={3,4,6}, then (Acup B) cap C is

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  18. In a class of 45 student, 22 can speak hindi and 12 can speck E...

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  19. In a certain town 25% families own a cellphone, 15% families own a sco...

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  20. Let A be a set represented by the squares of natural numbers ...

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