ANSWERS: 2
  • Call X the number of castles she built on Friday. On Thursday, she built X + 4 On Wednesday, she built X + 8 On Tuesday, she built X + 12 On Monday, she built X + 16 4 + 8 + 12 + 16 = 40. That leaves 40 castles to be split evenly over the five days, so 40/5 = 8 per day. 8 is your X value. Monday she built 8+16=24 Tuesday she built 8+12=20 Wednesday she built 8+8=16 Thursday she built 8+4=12 Friday she built 8. I dunno if that helps at all...
  • 80 = x + (x-4) + (x-4-4) + (x-4-4-4) + (x-4-4-4-4) 80 = x + (x-4) + (x-8) + (x-12) + (x-16) 80 = 5x - 40 120 = 5x x = 24 start with x being the number of castles built on the first day. x-4 becomes the number built on the second day. x-4-4 becomes the third day, etc.

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