In the shop,
14 of the books sold were English books.
15 of the remaining books sold were Science books. The ratio of the number of Science books sold to the number of Chinese books was 15 : 7. The number of Math books sold was 636. How many books were sold altogether?
English |
Remaining books |
Total |
1x25 |
3x25 |
4x25 |
|
Science |
Chinese |
Math |
|
|
1x15 = 15 u |
4x15 = 60 u |
|
|
15 |
7 |
|
|
25 u |
15 u |
7 u |
53 u |
100 u |
The number of Science books is repeated. Make the number of Science books the same. LCM of 1 and 15 is 15.
Number of Math books = 53 u
53 u = 636
1 u = 636 ÷ 53 = 12
Total number of books sold
= 100 u
= 100 x 12
= 1200
Answer(s): 1200