Solving a challenging PSLE Maths problem using the model approach (2) |
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QN: Helen and Dorothy have some marbles. If Helen gives Dorothy 15 marbles, both of them will have the same number of marbles. If Dorothy gives Helen 15 marbles, Helen will have twice as many marbles as Dorothy. How many marbles does each girl have? SOLUTION:  Therefore, Dorothy has 60 + 15 = 75 marbles and Helen has 60 + 15 × 3 = 105 marbles (shown) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The above content is an extract from "50 Challenging PSLE Maths Problems" - purchase a copy of the entire e-book HERE.
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YOU MAY WISH TO READ: Mr Frederick Koh's Primary Level Mathematics Worked Problems Set A conversation with Dr Yeap Ban Har Solving a challenging PSLE Maths problem using the model approach (1) |
