Harry has 50 books in his library. His sister Flora has twice as many books and their cousin Gary has half the books Harry has. How many books do the three of them own together?
Flora has 50*2= <<50*2=100>>100 books
Gary has 50/2= <<50/2=25>>25 books
Together they own 100+25+50= <<100+25+50=175>>175 books
#### 175