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

The video tutorial explains how to solve a ratio problem involving a piece of string 153 cm long, divided into three parts in the ratio of 4:2:3. The instructor demonstrates how to add the ratios, divide the total length by the sum of the ratios, and calculate the length of each piece. The solution is presented step-by-step, emphasizing the importance of understanding ratios and the method to solve such problems. The tutorial concludes with a discussion on the marks awarded for each step in the solution.

What is the total length of the string Sandra has?

• 153 cm

• 120 cm

• 100 cm

• 200 cm

How many parts does Sandra divide the string into?

• 5 parts

• 4 parts

• 3 parts

• 2 parts

What is the length of one part when the total length is divided by the sum of the ratio parts?

• 21 cm

• 19 cm

• 17 cm

• 15 cm

What is the length of the piece corresponding to the ratio part '4'?

• 85 cm

• 68 cm

• 51 cm

• 34 cm

What is the correct order of the lengths of the pieces?

• 51 cm, 68 cm, 34 cm

• 68 cm, 34 cm, 51 cm

• 34 cm, 51 cm, 68 cm

• 34 cm, 68 cm, 51 cm