If your teacher has 4 classes of chemistry, with 30 kids per class, how many tests does he have to grade? i did "class-->students--->tests" did a T chart and came up with 120 tests. now second part says, If your teachers takes 45 seconds to grade each test, how many hours should it take him to grade all of the tests?
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120 tests x 45s/test x hr/3600 Should be about 1.5 hours.
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isnt this physics anyway this will help u
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