Problema Solution
If 1 out of every 691 children is born with Down syndrome, and there are 7,000,000,000 people in the world, what percent of the population is made up of children with Down syndrome?
Answer provided by our tutors
we have the following proportion
1 out of 691 = x out of 7,000,000,000
1 : 691 = x : 7*10^9
the percentage = the children with Down syndrome/the total number of children = x/ 7*10^9 = 1 / 691
the percentage % is (1/691)*100 = 1.445%
1.445% of the population is made up of children with Down syndrome.