GCSE Secondary Maths Age 13-17 - Ratio, Proportion & Rates of Change: Ratios 2 - Explained

The video tutorial explains how to solve a problem involving counters in a bag with given ratios. It covers calculating the probability of picking a purple counter and then determining the probability of picking a red counter. The tutorial emphasizes the importance of understanding ratios and probabilities, and concludes with advice on practicing similar questions.

What is the ratio of red counters to blue counters in the bag?

• 5 to 1

• 1 to 5

• 17 to 3

• 3 to 17

If the probability of picking a purple counter is 0.2, what is the combined probability of picking a red or blue counter?

• 0.2

• 0.5

• 0.8

• 1.0

How many total parts are there in the bag according to the given probabilities?

• 20

• 25

• 30

• 35

What is the probability of picking a red counter from the bag?

• 4/25

• 3/25

• 2/25

• 1/25

Why is it important to practice ratio questions from past papers?

• They are easy to solve.

• They frequently appear in exams.

• They are not relevant to the topic.

• They are only for advanced students.