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

The video tutorial explains how to determine the fraction of black pens in a box given a ratio of black to green pens as 2 to 5. It breaks down the ratio into a fraction, showing that 2 out of 7 pens are black, and concludes with the final answer of 2/7, which is worth one mark.

What are the two types of pens mentioned in the box?

• Black and green pens

• Red and blue pens

• Black and blue pens

• Green and red pens

What is the ratio of black pens to green pens in the box?

• 5 to 2

• 2 to 3

• 3 to 5

• 2 to 5

If the ratio of black to green pens is 2 to 5, how many total parts are there?

• 5 parts

• 7 parts

• 2 parts

• 10 parts

What fraction of the pens in the box are black?

• 2/7

• 5/7

• 3/7

• 2/5

How many marks is the question about the fraction of black pens worth?

• Three marks

• One mark

• Two marks

• Four marks