P6 Math: Fraction of Remainder with Guess and Check

This question type requires students to be able to use part/whole models to visualize "Fraction of Total" and "Fraction of Remainder". The "Guess and Check" table will also be required here.

Such questions are common in Paper 2 of P6 exams.
Calculator usage is allowed

Teddy bought some apples from the market.
After he threw away 152 apples and gave 1/5 of the remaining apples to his sister, 
he was left with 4/7 of the apples bought. 
He packed the apples he had left into large boxes of 12 and small boxes of 8.
All the boxes were full without any apples left over.

What was the least number of boxes used by Teddy?


If the above question is easy, try to do the more challenging question below. 

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