Word problems and the Khan Academy

A word problem from the Khan Academy

Last year, I was asked by my American colleagues to give my assessment of mathematical material on the Khan Academy website. Among other things I looked for the so-called “word problems” and clicked on a link leading to what was called there an “average word problems” but happened to be a “word problem about averages”. It appears that the problem there changed since last year. I reproduce here the old one, it is more of interest for discussion of “word problems”.

Gulnar has an average score of \( 87\) after \( 6\) tests. What does Gulnar need to get on the next test to finish with an average of \( 78\) on all \( 7\) tests?

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