I am struggling with answering this question on averages where I have to find the number which the mean was divided by originally to work out the average. This is the question:
The average height of some children was $129.4$ cm. The height of one child was recorded wrongly as $119$ cm. His correct height should be $182$ cm. As a result, the correct average height of the children was $132.4$ cm. How many children were there?
Thank you and help is appreciated