Posted by fei on Thursday, November 1, 2012 at 11:30pm.
These kind of questions are often done incorrectly
9 a) missing information
b) if the ratio of red paint to white paint is 2 : 5
that means there are 2parts red and 5 parts white for a total of 7 parts
so the fraction of the paint which is red is 2/7
and 2/7 (100%) is appr 28.86%
10
a)30% or 30/100 or 3/10 of the mixture is peanuts
b) ratio of almonds to other nuts = 1 : 7
so the percentage of almonds in the mixture = 1/8(100%) = 12.5%
check:
suppose we have a 1000 g mixture
then amount of almonds = .125(1000) = 125 g
then amount of other nuts = 1000-125 = 875 g
so the ratio of almonds : other nuts
= 125 : 875
= 1 : 7
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