P5/P6 Math: Set Method (Difference Given)

The question below deals with "sets" with the difference between each total given.
Such questions are suitable for P5 and P6 and can appear in both paper 1 and 2.

Calculators are necessary whenever double-digit division or double-digit muliplication is required.

A pen costs $3 and a book costs $5.
For every 2 pens bought, 4 books were also bought.
The cost of all the books were $98 more than the cost of all the pens.

a) How many books were bought altogether ?
b) How much did all the pens and books cost altogether ?



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