If the unknown number is increased by 2/5 of the same number, then we get 20. Find the unknown number.

univerkov | August 2, 2021 | education

To solve this problem, we introduce a conditional variable “X”, through which we denote the required number. Then, based on the data of the problem, we compose the following equation: X + 2X / 5 = 20. Solving this equation, we obtain (5X + 2X) / 5 = 20 or 7X = 5 x 20 or 7X = 100 or X = 100/7 or 14 point 2/7.
Answer: the required number is equal to 100/7 or 14 integer 2/7.

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