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primary 6 | Maths
| Fractions
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From the question information, we can find out that ⅔ of English books and 7/9 of Science books were left.
So that's 2 units of English books and 7 units of Science books.
In the end, there are 350 more English books than Science books.
So this means that in terms of number of books, 2 units of English books = 7 units of Science books + 350
so 1 unit of English books = 3½ units of Science books + 175
Then 3 units of English books = 10½ units
of Science books + 525
We know total = 915 books
915 = 3 units of English books + 9 units of Science books
Since 3 units of English books = 10½ units
of Science books + 525 ,
915 = 10½ units of Science books + 525 + 9 units of Science books
915 = 19½ units of Science books + 525
390 = 19½ units of Science books
1 unit of Science books = 390 ÷ 19½
= 20
Number of English books removed
= 1 unit
= 3½ units of Science books + 175
= 3½ x 20 + 175
= 70 + 175
= 245
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