Maths P5

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Mr Neo has fewer than 200 sweets. He wants to give his class an equal number of sweets. If he gives each pupil 3 sweets, he will have 70 left over. If he gives 5 sweets, he will need 10 more sweets.
How many pupils are there in the class?
How many sweets does Mr Neo have?

  • Maths P5 -

    X = The total # of sweets.

    Y = The total # of pupils.

    Eq1: x - 3y = 70.
    Eq2: x -5y = -10.

    Subtract Eq1 from Eq2 and get:
    2y = 80,
    Y = 40 Pupils.

    In Eq1, substitute 40 for Y:
    x - 3*40 = 70,
    x - 120 = 70,
    X = 70 + 120 = 190 Sweets.

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