This question type requires students to work backwards to derive the initial number of both items at first.
A total of 2 different items are presented at first.
One of the items will be replaced with a multiple of the other item.
This is repeated until all of the items are now the same type.
Such questions are common in Paper 1 of P5 and P6 exam papers.
Calculator usage is not allowed.
Danielle has a total of 48 erasers and pens.
After trading each of her pen for 5 erasers,
she now has a total of 72 erasers after trading all her pens.
How many pens does she have at first?
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