Question

Pedro had 80% of the amount needed to buy a game. Of this amount, you spent 15% on a watch and therefore, you will need to add another R$640.00 to purchase this game. Is the value of the game?

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Answer:
2000
Step by step solution:
Let x be the amount of the game.
At first you have 80% of the amount. So, it is 0.8x.
15% of that, you used, that is (0.8x)(0.15)
We subtract that to the initial amount, 0.8x-(0.8x)(0.15)
The difference is 640 less than the amount of game, x - 640
So, we have x - 640 = 0.8x - (0.8x)(0.15)
Solve for x.
x = 2000

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