Correct Answer - Option 2 : 150
Given∶
In the Library, 25% of the books on Literature, 200 are on Fiction and rest are Novels.
Formula Used∶
Basics of Percentage, Ratios.
Calculation∶
By using basics Ratios concepts, the actual number of Novels, Fiction and Literature books may be assumed as 5x, 4x and 3x respectively with x as the common factor.
As number of Fiction books are 200, we can find the value of x easily,
4x = 200
x = 50
So, total number of books = 5x + 4x + 3x = 12x
Or, 12x = 12 × 50 = 600 and
Number of Literature books = 3x = 3 × 50 = 150
Assumed that number of Literature books to be purchased as y
So, 0.4(600 + y) = 150 + y
Or, 0.6y = 90
y = 150
∴ 150 new books of Literature are to be added to the Library collection.