Showing Mcqs of math -- (543)

How many ounces of pure acid must be added to 20 ounces of a solution that is 5% acid to strengthen it to a solution which is 24% acid?

5

33

23

22

 Nazir can wash a car in 15 minutes while his son takes twice as long to do the same job. If they work together, in how many minutes the job will be completed?

5

15

10

20

Sana can type a script in 10 hours. Kiran can type the same script in 5 hours. If they type this script together, it can be completed in:

2hrs

3hrs

3hrs and 20min

3hrrs and 43mins