P4/P5 Math: Spend and Left after buying 2 items (multiples of each other)

This question type requires students to draw comparison models and also a part/whole model to visualize the problem sum.

Such questions are common in WA2 in P4 exams and also Paper 1 in P5 exams.
Calculator usage is not allowed.

Steffi has $77 to spend at the mall.
After she bought a book and a camera, she has $14 left.
The camera costs thrice as much as the book.

How much was the book?

Vintage camera

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

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