book Maths Puzzle Numerical Ability

2/7x2&1/8x3=
6&1/28, 9/4, 1&23/28, or none of these?

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book Other Question

Increaing a number by five and then doubling the outcome is the same same as decresing the number by twelve 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?