Have a Great Summer Everyone!

Lock Challenge:
I have a 4-digit lock, and I can't remember the combination! But I do remember these clues...
  • The last number times the first number is a multiple of 10.
  • The last number is the number of edges on a cube minus the number of sides on a rhombus.
  • If the first number is x, the second number is x – 5.
  • The sum of all the digits of the combination is 20.
Could you open the lock?

Required Homework for over the summer:
For those of you who are not completely done with Xtramath.org, finish it over the summer! You need your math facts for 8th grade (and for life!).