A scientist prepares a mixture with two chemicals: chemical 1 and chemical 2 in proportion of 2:3 and makes a total concentration of 150ml. How many ml of chemical 1 has been used?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 60.
Chemical 1 : Chemical 2 = 2 : 3
Total = 150 ml
Total parts = 2 + 3 = 5
1 part = 150 ÷ 5 = 30 ml
Chemical 1 = 2 × 30 = 60 ml