Which of the following problem does NOT require proportional thinking ?
1
Cost of 20 kg of potatoes is Rs. 400. What would be the cost of 7 kg of potatoes?
2
Sakshama reads 10 pages in 15 minutes, how long would she take to read 20 pages ?
3
The height of a tree is 3 meters and the length of its shadow at 11:00 am is 4 meters. What would be the length of its shadow at4 pm ?
4
It takes 1 hour for a painter to paint 3 walls. How much time is needed to paint 15 similar walls ?