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Andrew has these marks: English 82% French 75% history 78% science 80% What mark will Andrew need in math if he wants his mean mark to be each percent? i)80% ii)81% iii)82%
Sometimes, the strategy guess and check is the simplest. 82, 75, 78, and 80. i) Let's try 80. All added together is 395 divided by 5 is 79%, which isn't enough. Now trying 85, the mean would be 80%. ii) Let's try 90's mean. It's 81%. iii) First, I'm going to try 95. The percentage mean is 82% I didn't have to guess for ii) and iii) since I saw a pattern happening.
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