AlgebraHardMarbles in one of three jars
Algebra practice question
Three jars hold 100 marbles in total. The first jar holds 10 more than the second, and the third holds the same as the second. How many marbles are in the first jar?
Answer: 40
With s in the second jar: (s + 10) + s + s = 100 gives s = 30, so the first jar holds 40.
Common wrong answers
- If you answered 30
- 30 is the second jar.
- If you answered 45
- 45 solves 2s + 10 = 100 for the first jar as if two jars only.
- If you answered 33.33
- 33.33 splits the marbles evenly.
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