GCSE Secondary Maths Age 13-17 - Number: Reverse Percentages - Explained

The video tutorial explains how to calculate waiting times at Wenford hospital using percentage calculations. It covers reverse percentage calculations to find the 2014 waiting time based on 2015 data and demonstrates how to calculate the percentage decrease needed to meet the 2016 target. The tutorial emphasizes understanding percentage changes and provides step-by-step guidance on solving these types of questions.

What is the concept of reverse percentage used for in the context of the hospital's waiting times?

• To find the future waiting time based on past data

• To calculate the original waiting time when a percentage decrease is known

• To determine the percentage increase in waiting times

• To compare waiting times between different hospitals

If the waiting time in 2015 was 68 minutes, which was 11% less than in 2014, what was the waiting time in 2014?

• 80 minutes

• 60 minutes

• 68 minutes

• 76 minutes

How do you calculate the original value when given a percentage decrease and the decreased value?

• Multiply the decreased value by the percentage decrease

• Divide the decreased value by the percentage decrease

• Add the percentage decrease to the decreased value

• Divide the decreased value by the remaining percentage

What is the formula used to calculate the percentage change between two values?

• Original value divided by the change, multiplied by 100

• Change divided by the new value, multiplied by 100

• Change divided by the original value, multiplied by 100

• New value divided by the change, multiplied by 100

What is the percentage decrease from 68 minutes to 60 minutes?

• 13.5%

• 12%

• 11.76%

• 10%