Question

A library has 500 books. They were history ,maths and science books. The ratio of the history to maths to science books is2:3:5. If 20 history ,30 maths, and 10 science books were added in the library find the new ratio of the history to the maths to the science books.

Answer 1

2x + 3x + 5x = 500
10x = 500
x = 50
Total no of history books = 2*50 = 100
Total no. of maths book = 3*50 = 150
Total no. of science book = 5*50 = 250

New no of history books = 100+20 = 120
New no of maths books = 150+30 = 180
New no of science books = 250+10 = 260
New ratio,
120:180:260 = 6:9:13

Hope the answer is correct............