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?

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