How many digits are in (8×10^12)(10×10^9)

How many digits are in (8×10^12)(10×10^9)?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #14231

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