P6 Math: Same total quantity of 2 different items of different values

This question type is made famous during the 2021's Math PSLE exams.

The "Helen and Ivan" question.

2 items of different quantities and value are split into 2 groups containing same number of items. The individual value difference a between 2 items and the total value of one of the group [ containing different quantities of 2 items ] are given.

This is a P6 PSLE Paper 2 question.
Calculator usage is allowed.

Helen bought 64 pencils and some notepads.
Ivan bought 104 pencils and some notepads.
Both Helen and Ivan bought the same total number of notepads and pencils.
Each notepad costs $2.70 more than each pencil.
Helen spent a total of $1134 on their pencils and notepads.

How much did Ivan spend on all his pencils and notepads?



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