Coolest Father and Son
In the equation TAOHONG + LEOHONG = COOLEST, different letters represent different single-digit non-negative integers. What's the value of COOLEST?
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Eight Coins
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A group of CMM students decide to buy a math workbook priced at $8.41. Looking at their piggy banks. they find that each student can contribute the same amount using the same set of eight coins. After each of them brings the eight-coin set from their piggy banks, they put the coins in a jar together. How many nickels are in the jar?
Consecutive Even Numbers
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The sum of 20 consecutive even numbers is 2020. What's the average of the first five even numbers of the same set?
Maximize the Expression
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Fill in the blanks of the expression 1 _ 2 _ 3 _ 2 _ 1 with all four basic arithmetic operators, and then add one pair of parentheses. What's the maximum value of the resulting expression?