Problem Solving Worksheets With Answer Key - Math Stars Page 31
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39Vol. 7 No. 8
8. [15] The odds: 1 + 3 + 5 + . . . + 29 = 225 while the evens: 2 + 4 + 6 + . . . + 30 = 240. Their
difference is 15. Or, for each odd number, the corresponding even number is one greater i.e. 2 - 1 = 1,
4 - 3 = 1, 6 - 5 = 1 . . . . Since there are 15 such pairs, the total difference is, again, 15.
9. [2,951,769,600 or 2,953,739,520 or 2,953,843,200] Computing for a non-leap year the results are:
72 beats/min. x 60 min./hr. x 24 hr./day x 365 days/yr. x 78 yrs = 2,951,769,600 beats.
Now for the leap years. Depending upon when the subject was born, s/he could experience 19 or 20
leap years (78 ÷ 4 = 19.5).
For 19 leap years we compute: 72 beats/min. x 60 min./hr. x 24 hr./day x 19 days = 1,969,920
additional beats for a total of 2,953,739,520.
For 20 leap years we compute : 72 beats/min. x 60 min./hr. x 24 hr./day x 20 days = 2,073,600
additional beats for a total of 2,953,843,200.
10.
TIME
APT.
AGE
Amy
8:00
E
11
Connor
6:00
A
14
Jalissa
8:15
B
10
Stella
7:30
C
9
Gonzo
7:00
D
13
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