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 Post subject: MathsPosted: Sat Feb 13, 2010 11:05 am

Joined: Sat Jun 21, 2008 11:56 am
Posts: 22
Hi

Pls help to solve this.

To obtain the colour green that Jack wants to paint his room he mixes 11 liters of yellow with 1 liter blue.
Jack will need 5 liters of green.

How much blue paint will Jack need?

(a) 1 1/4 liters (1.25liters)
(b) 1 1/2 liters (1.5 liters)
(c) 1 3/4 liters (1.75 liters)
(d) 2 1/4 liters (2.25 liters)

Thanks

Uma

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 Post subject: Posted: Sat Feb 13, 2010 12:15 pm

Joined: Thu Jan 03, 2008 8:26 am
Posts: 1327
Location: Watford, Herts
The recipe makes 12 litres of green paint, so to make 5 litres, he needs 5*11/12 = 4 7/12 litres of yellow and 5/12 litres of blue. However this is not one of the alternatives offered.

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 Post subject: Posted: Sat Feb 13, 2010 12:35 pm

Joined: Tue Oct 27, 2009 8:19 pm
Posts: 6560
Not sure that the answer is one offered.

Receipe makes 12 litres of paint. Jack needs 5 litres which is slightly under half of the receipe. Therefore, he will need slightly under 1/2 litre of blue - there is no answer that small!

Or am I being totally stupid. We were always taught to roughly estimate the answer before working out so we knew if we were completely off track or not.

_________________
Knowledge is knowing that a tomato is a fruit, wisdom is not putting it in a fruit salad !

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 Post subject: Posted: Sat Feb 13, 2010 7:31 pm
Perhaps it should be 15 litres of green that he needs. That would work then at 1.25l of blue

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 Post subject: Posted: Sun Feb 14, 2010 6:51 am

Joined: Sat Jun 21, 2008 11:56 am
Posts: 22
May be typing error on the book

but the answer 1.25 is correct.

Thanks

Uma

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