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Sam and Albert paint a fence for four hours, after which John helps them and they finish two hours later. If John had not helped them, it would have taken them five more hours to paint the fence. How long would it take John to paint the fence alone?

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a chemist has one solution containing 50 % acid and a second one containing 25% of acid how much of each should be used to make 10 litres of a 40 % acid solution ? let the quantity of 50% acid as (a) and the quantity of 25%acid as (b) then write the answer as 50 *a + 25 *b A candidate must get 33% marks to pass. He gets 220 marks and fails by 11 marks. what is the number of maximum marks?