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P4 Math: Assumption Method

There are 30 questions in a Science contest. 
6 marks will be awarded for each correct answer.
4 marks will be deducted for each wrong answer.
All the questions must be answered.

If Sakinah scores 100 marks in the Science contest, how many questions does he answer correctly ?

Solution:

P6 Math: Supervisor and Worker

If 1 supervisor and 3 workers are working together they will complete a task in 4 days.

If 2 supervisors and 1 worker are working together they will take 3 days to complete the task. How long will it take to complete the task if 1 worker is to work alone on the task ?

Solution