book Maths Puzzle Numerical Ability

a pile contains 1200 coins. Each day penny nichols takes 20% of the coins from the pile. Approximately how many coins remain in the pile after 7 days?

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book Other Question

my son needs three interesting facts about algebra Can you please explain to me what an algebraic proof is? I know you give a statement such as: all alternate interior angles are congruent. But how would you prove the statement?