Valli buys 10 pens for Rs. 180 and Kamala buys 8 pens for Rs. 96. Can you say who bought the pen cheaper? (using unitary method)

Every 3 months Tamilselvan deposits Rs.5000 as savings in his bank account. In how many years he can save Rs.1,50,000

If the cost of 6 cans of juice is Rs.210, then what will be the cost of 4 cans of juice?

A truck requires 108 liters of diesel for covering a distance of 594 km. How much diesel will be required to cover a distance of 1650 km?

Six men can complete a work in 12 days. Two days later, 6 more men joined them. How many days will they take to complete the remaining work?