Question
PSLE
At first, Shannon had 78 erasers and some marbles. After she gave away 56 erasers and 25% of the marbles, she had a total of 31 erasers and marbles. How many marbles did Shannon have at first?
3 m

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PSLE
At first, Shannon had 78 erasers and some marbles. After she gave away 56 erasers and 25% of the marbles, she had a total of 31 erasers and marbles. How many marbles did Shannon have at first?