I questioned OP's "there is an answer online" claim so I checked and the only source found for the original question was a 5th grade Russian school for mathemat

I questioned OP's "there is an answer online" claim so I checked and the only source found for the original question was a 5th grade Russian school for mathematics. https://aistudio.google.com/app/prompts?state=%7B%22ids%22:%5B%221kj6r9fOIshFmCwcNpQDcfEFnFdYezjkm%22%5D,%22action%22:%22open%22,%22userId%22:%22110194568010056725318%22,%22resourceKeys%22:%7B%7D%7D&usp=sharing https://aistudio.google.com/app/prompts?state=%7B%22ids%22:%...