Question

4/9 of the visitors to the aquarium one afternoon were children, 2/5 were adults, and the rest were senior citizens. If there were 180 people altogether, how many were senior citizens?

Answer 1

Answer:

28 were senior citizens

A common denominator between 9 and 5 is 45.

4  ·5  20               2  ·9  18

9  ·5  45               5  ·9  45

20/45 + 18/45 is 38/45

38/45=x/180

solve for x

38  ·4= 152

45  ·4= 180

152 out of the 180 visitors were NOT senior citizens.

180-152=28

28 visitors were senior citizens

Hope this helped :)