#18 Mrs. Rothberg baked 500 muffins on Saturday and 3 times as many muffins on Sunday. If the sold 5 muffins for $4, how much wo
uld she earn by selling her muffins on both days? #19 Jack had $80 more than Eric. When Jack spent $30, he found that the amount of money he had left was twice as much as what Eric had. How much did the boys have altogether in the beginning?
#18: She bakes 500 muffins on Saturday. If she bakes 3 times as many on Sunday, 500*3=1500. 1500 plus the original 500 muffins is 2000 muffins. 2000*4=$8000 made.
#19: Jack has $80 more than Eric. So if Eric's amount of money is x, then Jack's amount of money is x+$80. When Jack spends $30, then Jack only has x+$50 because 80-30 is 50. If Jacks amount of money is 2 times the amount Eric has, then x+$50 must equal 2x. Subtract x from both sides to get 50=x. So, Eric has 50 dollars. This means that Jack has 130 dollars. 50+130= $180.
To solve, we use the volume of a square pyramid formula which is expressed as the product of the area of the base (a²) and the height divided by three(h/3).
Volume = a² (h/3) 1024 in³ = (a²) (12 in/3) a² = 1024 in³ · 3 /12 a = √256 in² a = 16 in
