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2 0 % Clue
20 PERCENT. FOR EXAMPLE, THERE ARE 10 BOLTS. SINCE THE NUMBER OF BOLTS IS 25 PERCENT OF THE NUMBER OF ITEMS, THERE MUST BE 40 NUTS. THE TOTAL NUMBER OF ITEMS = 10 BOLTS + 40 NUTS = 50. SO, 10/50 = 1/5 = 20% A TOTAL OF NINE COINS ARE NEEDED: FOUR (1¢) PENNIES, ONE (5¢) NICKEL, TWO (10¢) DIMES, ONE (25¢) QUARTER AND ONE (50¢) HALF-DOLLAR THE MISSING NUMBER IS 4. SIMPLY ADD THE FIRST AND SECOND ROWS TOGETHER TO GET THE THIRD ROW VALUE. 65, 927 + 14, 354 80, 281 YOU WOULD ONLY NEED TO TAKE OUT ONE MARBLE BECAUSE WE KNOW THAT ALL OF THE LABELS ARE INCORRECT. SO YOU PULL ONE MARBLE OUT OF THE BOX LABELED "MIXED." IF RED COMES OUT, YOU KNOW THAT HAS TO BE THE ALL-RED BOX, SO YOU PUT THE RED LABEL ON IT. THE BOX LABELLED "BLUE" MUST THEN BE LABELLED "MIXED" BECAUSE YOU KNOW IT IS ALSO LABELED INCORRECTLY, AND THEREFORE CAN'T BE BLUE. YOU WOULD LABEL THE LAST BOX "BLUE" BECAUSE THAT IS THE ONLY COLOR/BOX COMBO LEFT. IF THE FIRST MARBLE YOU PULLED OUT FROM THE BOX LABELED "MIXED" IS A BLUE MARBLE, THEN YOU SOLVE THE PROBLEM IN THE SAME GENERAL WAY