convert each fraction to the least common multiple of 20, so 3/4 = 15/20 & 1/10 = 2/20, then divide 15 by 2 and you get a little over 7, so the food will last 7 weeks.
Your family has $745 for vacation. they spend 40℅ of the money on a hotel. they spend the remaining 1/3 on food. enter the amount of money your family will have left for activities