The piggy bank
You have stealthily raided your small child’s piggy bank. You feel slightly guilty as you count the money you have the same number of dimes and quarters, totaling exactly $2.45. When you turn honest and put it back, how many of each coin will you need to replace? (Your child keeps a record of how much she puts in and in what denomination, of course).
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Seven of each coin.
Take from the pack the thirteen cards forming the suit of diamonds and arrange them in this order face downwards with the 3 at the top and 5 at the bottom: 3, 8, 7, Ace, Queen, 6, 4, 2, Jack, King, 10, 9, 5. Now play them out in a row on the table in this way. As you...