In the book shop,
14 of the books sold were English books.
13 of the remaining books sold were Chinese books. The ratio of the number of Chinese books sold to the number of Math books was 5 : 7. The number of Science books sold was 9. How many books were sold altogether?
English |
Remaining books |
Total |
1x5 |
3x5 |
4x5 |
|
Chinese |
Math |
Science |
|
|
1x5 = 5 u |
2x5 = 10 u |
|
|
5 |
7 |
|
|
5 u |
5 u |
7 u |
3 u |
20 u |
The number of Chinese books is repeated. Make the number of Chinese books the same. LCM of 1 and 5 is 5.
Number of Science books = 3 u
3 u = 9
1 u = 9 ÷ 3 = 3
Total number of books sold
= 20 u
= 20 x 3
= 60
Answer(s): 60