Answer: Having your students do speed drills is a way to help them learn quite fast.
Step-by-step explanation:
Answer:

Step-by-step explanation:
Let
represent the amount of money he initially started with.
After he spent 20% on books, he will have
of his initial money left. We can represent this as
.
Following that, the boy spends 20% of the remainder of his money on food. Similarly, he will have
of the remainder of money he had left after he purchased the books. Therefore, he ends up with
of his money left.
Since we're given that he had $2,000 after all these transactions, we have the following equation:

Divide both sides by 0.64 to isolate and solve for
:

Therefore, the boy had $3,125 to begin with.
Sry I'm couldn't solve the second one but the ans for the 1st is 504 sq units
Answer:
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Step-by-step explanation: