Question

The ratio of mystery books to fantasy books in the library is 7:9.

Fill in the missing values to show the possible number of
mystery and fantasy books.
Mystery Books Fantasy Books
21
Select Answer -
63
Select Answer -
27
54
Select Answer
117

Answer 1

42

81

91

Explanation:

m = mystery

f = fantasy

`(m)/(f)` =
`(m)/(f)`

Compare the ratio with the actual numbers. Solve for the missing number

`(7)/(9)` =
`(m)/(54)` you need to multiply 9 by 6 to get 54 so multiply 7 x 6 to get 42.

`(7)/(9)` =
`(63)/(f)` Multiply 7 x 9 to get 63,so multiply 9 by 9 to get 81.

`(7)/(9)` =
`(m)/(117)` 9 x 13 is 117, so multiply 7 by 13 to get 91.