This question type starts with a ratio and after both values undergo some decrease, a new ratio is given.
Both values undergo another addition and that causes both values to become the same at the end.
Such questions are common in P6 Prelim Paper 2.
Calculator usage is allowed.
Benedict and Erica has erasers in the ratio of 5:7 respectively.
After Benedict gave away 3/7 of his erasers and Erica sold some erasers,
the ratio of Benedict's to Erica's remaining erasers became 10:7.
Benedict then bought another 60 erasers and Erica bought 240 erasers.
Each have the same number of erasers at the end.
How many erasers does Erica have at first?
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