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Welcome to Varsity Math, the weekly math puzzle column by the National Museum of Mathematics and featured each weekend in the Wall Street Journal.
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Alternative Sum and Product
The sum of the digits from 1 to 9 is 45 and their product is 9 factorial = 1 × 2 × 3 × 4 × 5 × 6 × 7 × 8 × 9 = 362,880.
Find another set of nine single-digit numbers with a sum of 45 and a product of 9 factorial. Digits may be repeated.
Math Quiz
Aileen, Brian, Laurie and Sue have just received the results of a math quiz they took. Each problem correctly solved earns the same number of points.
Aileen: Our average was half a perfect score.
Brian: I got three wrong.
Laurie: I got nine correct.
Sue: I got eleven wrong.
How many problems did Aileen get correct?
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Solutions to week 146
In Mailing Problem, the coach’s package had a volume of 360 with dimensions (9, 8, 5). Prior to that, the coach had considered a box with dimensions of (10, 9, 4). In Pool Party, the coach’s yard is 34 feet by 34 feet.
Pool Party answer explained:
Let P = (9, 2) be the coordinates of the corner of the walkway that touches the pool and let C = (r, r) be the coordinates of the center of the pool. Then r2 = (r-9)2 + (r-2)2. This leads to r = 17 ft., so the yard is 34 ft. by 34 ft. The other root with r = 5 ft. would have the pool overlap the walkway.
Recent Weeks
Week 146: Mailing Problem & Pool Party, solutions to Find m and n & Escape Room
Week 145: Find m and n & Escape Room, solutions to Liar’s Club & Palindrome Times
Week 144: Liar’s Club & Palindrome Times, solutions to Staircase Numbers & Arithmetical Question
Week 143: Staircase Numbers & Arithmetical Question, solutions to A Golden Set & Combining Rule
Week 142: A Golden Set & Combining Rule, solutions to Sudoku Variant & Making 8 and 16
Links to all of the puzzles and solutions are on the Complete Varsity Math page.
Come back next week for answers and more puzzles.