Such questions presents 2 values to be multiples of each other at first.
One of the value undergo a change(addition/subtraction) and the resulting difference is given after the chance.
Such questions require students to use "Before and After Comparison Models" to visualize the changes and to also be aware that one of the values "did not change".
These questions are common in Section C of P3 and P4 exam papers.
There were thrice as many boys as girls whom were in the school hall at first.
After 15 boys left the school hall to go toilet,
there were still 17 more boys than girls remaining in the hall.
How many students were there altogether in the school hall at first?
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