Suppose $77\cdot 88\cdot 99 \equiv n\pmod{20}$, where $0\le n<20$.

What is the value of $n$?
Question:
Suppose $77\cdot 88\cdot 99 \equiv n\pmod{20}$, where $0\le n<20$.

What is the value of $n$?
Answer:
Let's think step by step.

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Suppose $77\cdot 88\cdot 99 \equiv n\pmod{20}$, where $0\le n<20$.

What is the value of $n$?
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