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If A+ B= 120, B+ C …

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If A+ B= 120, B+ C = 50, C+ A= 110 ,then calculate B

    • Posted by Mansi Shrivastava 7 years, 9 months ago

    CBSE > Class 11 > Mathematics
    • 3 answers

    Swarnali Mondal 7 years, 9 months ago

    Oh yes by mistake I have written 110+70= 200 ,it would be 180 and then A= 90 . So,90+B=120=>B=30. Sorry , for the mistake??

    2Thank You

    Sumit Singh 7 years, 9 months ago

    A+B=120 eq. 1 B+C=50 eq. 2 C+A=110 eq. 3 =》 from eq. 1 A=120-B Substituting the value (A=120-B) in eq. 3 we get, C+(120-B)=110 C=B-10 Substituting the value ( C=B-10 ) in eq. 2 we get, B+(B-10)=50 2B=50+10 B=30

    1Thank You

    Swarnali Mondal 7 years, 9 months ago

    A+B-(B+C)=120-50. => A-C=70 =>A-C+C+A=70+110=200. 2A=200. A=100 Since,A+B=120 and A =100 So,B=20

    2Thank You

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