They need to lose weight in the basket (throw off items), and also make the flame more powerful, too make the balloon rise.
I believe the answer is: <span>tiered lessons
</span><span>tiered lessons refers to a study approach that is aimed to make student in the class to utilize various cognitive skills in order to tackle different problems.
This approach is used to make the class become more flexible and not forcing the children to stick into one specific way of learning.</span>