45 days stratergy

Nalini wants to introduce the topic on 'Animals -our friends' to class III students. In order to introduce the topic more interestingly, the best teaching stratergy would be to

A fort had provision of food for 150 men for 45 days. After 10 days, 25 men left the fort. The number of days for which the remaining food will last, is

45 men can complete a work in 16 days.Six days after they started working,30 more men joined them.How many days will they now take to complete the remaining work?

A certain number of men complete a work in 45 days. If there were 5 men more, the work could be fin- ished in 9 days less How many men were originally there?

If in a hostel, food is available for 45 days for 50 students. For how many days will this food be sufficient for 75 students ?