Final answer is
Luis brought 22.5 pesos to the mall.
To find out how much money Luis brought to the mall, we need to add up the fractions of the money he spent. Luis spent 1/2 of his money on chocolates, 1/3 on don as, and 1/10 on maquinitas. To combine these fractions, we need to find a common denominator. In this case, the common denominator is 30. So, we have:
Luis spent 15/30 on chocolates (since 1/2 is the same as 15/30).
Luis spent 10/30 on don as (since 1/3 is the same as 10/30).
Luis spent 3/30 on maquinitas (since 1/10 is the same as 3/30).
To find out how much money Luis had initially, we need to add up these fractions: 15/30 + 10/30 + 3/30 = 28/30.
We know that Luis had 12 pesos left after shopping, which is the same as 12/30. To find out how much money Luis brought to the mall, we subtract what he had left from what he initially had: 28/30 - 12/30 = 16/30.
To convert this fraction to pesos, we divide the numerator (16) by the denominator (30) and multiply by the total amount of money Luis had: (16/30) * x = 12 pesos.
Solving for x, we find that x = 22.5 pesos. Therefore, Luis brought 22.5 pesos to the mall.