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

The video tutorial explains how to solve a problem involving pens in a box. It starts by determining the number of red pens and calculating the fraction of red pens in the box. The tutorial then moves on to finding the ratio of green pens to red pens and simplifies this ratio to its simplest form using a calculator. The video emphasizes understanding fractions and ratios, as well as simplifying them.

How many pens in total are in the box?

• 50

• 20

• 35

• 15

What is the fraction of red pens in the box?

• 15/20

• 20/35

• 20/15

• 15/35

How many red pens are there in the box?

• 10

• 20

• 35

• 15

What is the initial ratio of green pens to red pens?

• 15 to 20

• 20 to 15

• 3 to 4

• 4 to 3

What is the simplified ratio of green pens to red pens?

• 20 to 15

• 4 to 3

• 3 to 4

• 15 to 20