Question 828534

225 children attended the skool concert which represents 90% of the skool's enrolment.What number of children would have been at the concert had 30% attended instead.

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With T being 30% of children, and since 90% represents 225, then we can use the following proportion: .9/.3 = 225/T
Note that this proportion is “saying”: If 90% represents the number 225, then what number represents 30%?

Solving {{{.9/.3 = 225/T}}}, we get:
.9T = .3(225) ------ Cross-multiplying
.9T = 67.5
T, or number of children representing 30% of enrollees = {{{67.5/.9}}}, or {{{675/9}}}, or {{{highlight_green(75)}}}
You can do the check!! 

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