2[(7-3)5 - 8) =
=
(Simplify your answer.)

Ratio of times taken by Dan and David is 7 : 12

Solution:

Given that,

Dan and David are marking exam papers

Each set takes Dan 35 minutes and David 1 hour

Dan = 35 minutes

David = 1 hour = 60 minutes

Express the times Dan and David take as a ratio

Dan : David = 35 : 60

Reduce, by dividing ratio by 5

Dan : David = 7 : 12

Thus the ratio of times taken by Dan and David is 7 : 1