Question

A painter paints 15 walls in 5 days working 10 hours a day, then in how many days the painter will paint 60 walls working 30 hours a day?

• A. $\frac{20}{3}$
• B. 8
• C. $\frac{21}{5}$
• D. 10

Answer 1

The correct option is A $\frac{20}{3}$

To paint more walls, more days have been required, so it is in direct proportion. The multiplying factor is 60/15.

If more hours spend on painting, then less days will be required, so it is indirect proportion. The multiplying factor is 10/30.

x=5×(60/15)×(10/30)=20/3

Therefore, 20/3 days have been required.