Answer:
YES it's correct
Explanation:
because the work, that was done on the first problem is correct
2. Problems in society.
4. Problems in the way of betterment.
It's a piece of cake It's easy by itself
It's raining cats and dogs It's raining hard by itself
Kill two birds with one stone Get two things done with a single action by itself
Let the cat out of the bag Give away a secret as part of a sentence