MO Z8-I-1 2018
Fero and David meet daily in the elevator. One morning they found that if they multiply their current age, they get 238. If they did the same after four years, this product would be 378. Determine the sum of the current ages of Fero and David.
Correct answer:

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You need to know the following knowledge to solve this word math problem:
- algebra
- quadratic equation
- equation
- integer equation
- system of equations
- biquadratic equation
- basic functions
- reason
- numbers
- natural numbers
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