Problem: How to control armyworms
Look for early signs.
Because they feed at night, you may not see the caterpillars right away. Brown spots on your lawn are often the first sign that you have an armyworm problem.

Answer: An increase of the number of birds in your yard may be an indication of armyworms. The earlier you treat the problem, the easier it is to control and less damage a lawn will sustain.

Problem: A man is showing a boy trying to solve a rubix cube. a timer

Answer: is going to time the boy and other people around him are trying as well.

Problem: How to synthesise organic compounds
Check if the starting chemical is a mixture.
If your starting chemical is something like crude oil, you'll need to use distillation or fractional distillation to separate it into parts.
See if the starting and target chemicals have any groups in common.
Answer: For example, they may contain an amine group or a carboxyl group, etc. If the starting chemical is a mixture, look at which parts can be used.