a library has 500 books . there were history , maths and science books . the ratio of the history to maths to science books is 2:3:5 . if 20 history , 40 maths , and 10 science books are added in the library , find the new ratio of the history to the maths to the science books
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Answer:
12 : 19 : 26
Step-by-step explanation:
2x + 3x + 5x = 500
10x = 500
x = 500/10 = 50
HISTORY = 2x = 2 x 50 = 100 + 20 = 120
MATHS = 3x = 3 x 50 = 150 + 40 = 190
SCIENCE = 5x = 5 x 50 = 250 + 10 = 260
HIS : MATHS : SCI = 120 : 190 : 260
= 12 : 19 : 26
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