answer to the IQ question

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A + B = 76, A - B = 38, A / B = ?. A + B = 76 ... Eqn 1, A -B = 38 .. Eqn 2. From equation 2 find A, A - B = 38, A = 38 + B. Sub A into eqn 1 A + B = 76, 38 + B + B = 76, 38 + 2B = 76 collect the like terms. 2B = 76 - 38, 2B = 38 there4, B = 38/2 = 19. A + B = 76, A + 19 = 76, A = 76 - 19 = 57. A = 57, B = 19. A/B = 57/19 = 3.

Comments

  1. Sir OyeroMarch 18, 2014 at 9:51 AM

    A + B = 76, A - B = 38, A / B = ?.
    A + B = 76 ... Eqn 1, A -B = 38 .. Eqn 2. From equation 2 find A, A - B = 38, A = 38 + B.
    Sub A into eqn 1
    A + B = 76, 38 + B + B = 76,
    38 + 2B = 76 collect the like terms.
    2B = 76 - 38, 2B = 38 there4, B = 38/2 = 19.
    A + B = 76, A + 19 = 76, A = 76 - 19 = 57. A = 57, B = 19.
    A/B = 57/19 = 3.

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