P6 Math: Decreasing sets with remaining

The question type below deals with decreasing sets
The starting ratio is given and each time, a set of 2 different values is deducted.

Such questions often appear in P6 mid year and prelim papers.
This is a paper 2 question so calculator is allowed.

Miss Teo had 1/3 as many chocolates as sweets.
After she gave each of her students 4 chocolates and 3 sweets.
she had 6 chocolates and 180 sweets left.
How many students does she have?


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