P6 Math: Equal Quantity after 2 Parties undergo Fractional Decrease

The question presents 2 different items, each of different value and quantity.
After each undergo a fractional decrease, both items have the same number remaining.
The unit value of each item and the total value of the remaining items are provided.

Such questions require students to make use of "Equal Value Fractions" in order to solve.

These type of questions will usually appear in Paper 2 of P6 exams.
Calculator usage is allowed.

Craig has a stack of $2 and $10 notes.
After using 2/9 of the $2 notes and 3/5 of the $10 notes to buy a figurine,
he has equal number of $2 and $10 notes remaining.
He has $672 left at the end.

How much money did Craig have at first? 


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