Question 1163135
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The marks are  4x (English),  5x (Math)  and  6x (Science).


The equation is


    6x = 4x + 5x - 42


Simplify and solve


    6x = 9x - 42

    42 = 9x - 6x

    42 = 3x

     x = 42/3 = 14.


<U>ANSWER</U>.  The mark in English is  4*14 = 56.
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Solved.