Philip Fitter exercised each weekday.

On Monday he did 7 chin-ups.
On Tuesday he did 7 chin-ups.
On Wednesday he did 5 chin-ups.
On Thursday he did 11 chin-ups.

How many chin-ups did he do on Friday if his average (mean) for the five day week was 9 chin-ups per day?

Rintin Rep exercised each weekday this week. On Monday he did 7 chin-ups.

Each day his average number of chin-ups per day increased by one.

How many chin-ups did he do on Friday?

Barry Blue exercised each weekday this week. On Monday he did 7 chin-ups.

Each day his average number of chin-ups per day doubled.

How many chin-ups did he do on Friday?

Sonia Strong exercised each weekday this week. On Monday she did x chin-ups.

Each day her average number of chin-ups per day increased by one.

How many chin-ups did she do on Friday?

Hetty Health exercised each weekday this week. On Monday she did x chin-ups.

Each day her average number of chin-ups per day doubled.

How many chin-ups did she do on Friday?

Topics: Starter | Algebra | Averages | Problem Solving

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Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers for Philip, Skinny and Barry.

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 Teacher, do your students have access to computers such as tablets, iPads or Laptops?  This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=April26 However it would be better to assign one of the student interactive activities below.

Here is the URL which will take them to a related student activity.

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