book Maths Puzzle Numerical Ability

using the numbers 2,4,6,8,and10 exactly once with any operation signs and grouping symbols to write an expresion equal to 0

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book Other Question

it takes 4 hours for 9 cooks to prepare a school lunch. How long would it take 6 cooks to prepare the lunch?
it would take 6 cooks _____hours.
is it 2.66?
11b+9_>10b-4