In the bookstore,
16 of the books sold were English books.
15 of the remaining books sold were Math books. The ratio of the number of Math books sold to the number of Chinese books was 3 : 10. The number of Science books sold was 20. How many books were sold altogether?
| English |
Remaining books |
Total |
| 1x3 |
5x3 |
6x3 |
| |
Math |
Chinese |
Science |
|
| |
1x3 =
3 u |
4x3 =
12 u |
|
| |
3 |
10 |
|
|
| 3 u |
3 u |
10 u |
2 u |
18 u |
The number of Math books is repeated. Make the number of Math books the same. LCM of 1 and 3 is 3.
Number of Science books = 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Total number of books sold
= 18 u
= 18 x 10
= 180
Answer(s): 180
