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In a library the ratio of story books and other books is 7 : 2 and there are 1512 story books. Due the collection of some more story books the said ratio becomes 15 : 4. The number of story books collected is
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- 108
- 100
- 205
- 97
Correct Option: A
Story books ⇒ 1512
| Other books ⇒ | × 1512 = 432 | |
| 7 |
Additional story books = x
| ∴ | = | ||
| 432 | 4 |
⇒ 6048 + 4x = 432 × 15 = 6480
⇒ 4x = 6480 – 6048 = 432
| ⇒ x = | = 108 | |
| 4 |
