IBPS SO Prelims Exam Model Paper 6

Calculation:
Total number of Science books in four libraries = 1400
⇒ Total number of Science books in library A = 1400 – 200 – 300 – 500 = 400
Total number of books in library A = 400 + 200 + 300 + 350 = 1250
⇒ Total number of books in library C = 3910 – 1250 – 870 – 1010 = 780
Total number of Commerce books in library C = 780 – 300 – 100 – 200 = 180
⇒ Total number of Commerce books in four libraries = 300 + 220 + 180 + 160 = 860
Required percentage = (

860

3910

) × 100
⇒ 21.99% ≈ 22%
∴ The required percentage is 22%