Q233
Two alloys contain tin and iron in the ratio of 1 : 2 and 2 : 3. If the two alloys are mixed in the proportion of 3 : 4 respectively (by weight), the ratio of tin and iron in the newly formed alloy is = ?
A.
14 : 25
B.
10 : 21
C.
12 : 23
D.
13 : 22
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
According to the question,
| Sn | : | Fe |
| A → 1 | : | 2 = 3) × 5 |
| B → 2 | : | 3 = 5) × 3 |
| Sn | : | Fe |
| A → 5 | : | 10 = 15) × 3 |
| B → 6 | : | 9 = 15) × 4 |
| Sn | : | Fe |
| A →15 | : | 30 |
| B →24 | : | 36 |
| 39 | : | 66 |
= 39 : 66
= 13 : 22