Identify these questions

One of the types of coding and solving worded problem questions are those to do with unknowns of multiple variable.

They seem tricky at first, but once you do some practice, you’ll find them super simple!

They look like this:

The difference between two numbers is 25. The number is less than 6 and the last number is divisible by 6 without any remainder. Find these numbers.

A distinguishing characteristic of these questions is that there are two unknowns and you need to find them.

The strategy to answer these questions

To answer these questions:

• Find the requirement
• Set up the constraints to eliminate options
• Trial reasonable possible values for 1 of the variables and then the second variable
• The variable that meets the requirements and is in the answer options is the correct one.

Example Question/s

Watch video for explanation of the following question/s:

The sum of two numbers is 63, and one of them is 15 more than the other. What are the two numbers?

A 25 and 40

B 24 and 39

C 38 and 25

D 29 and 34

The difference between two numbers is 25. The number is less than 6 and the last number is divisible by 6 without any remainder. Find these numbers.

The perimeter of a scalene triangle is 12 cm. One side is 2 cm. Side 1 of the other two sides is 2 cm greater Side 2 of the other two sides. How long does each of the other two sides measure (in centimetres)?

Key Rules to remember

• Set up the constraints to eliminate options
• Trial reasonable possible values for 1 of the variables and then the second variable
• The variable that meets the requirements and is in the answer options is the correct one.

Practice time!

Now, it's your turn to practice.

Click on the button below and start your practice questions. We recommend doing untimed mode first, and then, when you're ready, do timed mode.

Every question has two solutions videos after you complete the question. The first is a quick 60 second video that shows you how our expert answers the question quickly. The second video is a more in-depth 5-steps or less explainer video that shows you the steps to take to answer the question. It's really important that you review the second video because that's where you'll learn additional tips and tricks.

Once you're done with the practice questions, move on to the next checkpoint.

Now, let’s get started on your practice questions.

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