Answer this question:Maria is a saleswoman at a flower shop. On the first day, she sold 30 tulips and 20 roses. The next day, she doubled the previous day's sales. On the third day, she sold only 10% of the tulips sold on the second day and 16 roses. The price of one tulip is $2 and one rose is $3. How much did Maria earn over these three days?
On the second day, Maria sold 30 * 2 = 60 tulips. She also sold 20 * 2 = 40 roses the second day. On the third day, Maria sold only 10 / 100 * 60 = 6 tulips. Over these three days Maria sold 30 + 60 + 6 = 96 tulips. She also sold 20 + 40 + 16 = 76 roses. So on the tulips Maria earned 96 * 2 = $192. And on roses Maria earned 76 * 3 = $228. In total, over these three days, Maria has earned 192 + 228 = $420.
The answer is 420.

Answer this question:Jenny had $24 left after spending 3/7 of her money. How much is half of her original amount of money?
Jenny spent 1 - 3 / 7 = 4 / 7 of her money. Since 4 / 7 is equal to $24, then 1 / 7 is equal to $24 / 4 = $6. So, Jenny originally had $6 x 7 = $42. Therefore, half of her original amount of money is $42 / 2 = $21.
The answer is 21.

Answer this question:Beth had 150 students in her 10th-grade class. The following year 30 more students join. In her final year, 15 students left. How many students did Beth have in her class at the end of her final year?
Beth had 150 students her 10th - grade year, and added 30 more the following for a total of 150 + 30 = 180 students. In her final year, 15 students left her class, bringing her total to 180 - 15 = 165 students.
The answer is 165.

Answer this question:There are six more white birds next to a cage than grey birds in the cage. If the number of grey birds in the cage is 40, and after ten minutes, half of the birds in the cage are freed and fly away, calculate the total number of birds remaining.
If the number of grey birds is 40, there are 40 + 6 = 46 white birds near the cage. When half of the grey birds fly away, the number that remains is 1 / 2 * 40 = 20. The total number of birds is 20 + 46 = 66 in and next to the cage.
The answer is 66.