Simultaneous equations

  • The Simple Life
    problem

    The Simple Life

    Age
    11 to 14
    Challenge level
    2 out of 3

    The answer is $5x+8y$... What was the question?

  • Small pepper seedlings in orange pots.
    problem

    Not a Polite Question

    Age
    11 to 14
    Challenge level
    2 out of 3

    When asked how old she was, the teacher replied: My age in years is not prime but odd and when reversed and added to my age you have a perfect square...

  • Small tomato seedlings in pink pots.
    problem

    Whole Numbers Only

    Age
    11 to 14
    Challenge level
    2 out of 3

    Can you work out how many of each kind of pencil this student bought?

  • Quadruple Clue Sudoku
    problem

    Quadruple Clue Sudoku

    Age
    11 to 16
    Challenge level
    1 out of 3

    Four numbers on an intersection that need to be placed in the surrounding cells. That is all you need to know to solve this sudoku.

  • Another Quadruple Clue Sudoku
    problem

    Another Quadruple Clue Sudoku

    Age
    11 to 16
    Challenge level
    1 out of 3

    This is a variation of sudoku which contains a set of special clue-numbers. Each set of 4 small digits stands for the numbers in the four cells of the grid adjacent to this set.

  • Simultaneous Equations Sudoku
    problem

    Simultaneous Equations Sudoku

    Age
    11 to 18
    Challenge level
    1 out of 3

    Solve the equations to identify the clue numbers in this Sudoku problem.

  • All-Variables Sudoku
    problem

    All-Variables Sudoku

    Age
    11 to 18
    Challenge level
    1 out of 3

    The challenge is to find the values of the variables if you are to solve this Sudoku.

  • LCM Sudoku II
    problem

    LCM Sudoku II

    Age
    11 to 18
    Challenge level
    1 out of 3

    You are given the Lowest Common Multiples of sets of digits. Find the digits and then solve the Sudoku.