............................
...............................................................................................................................................................................................................................................................................................................
Use any letter "x" is the usual one but since you have 2 you can use 2 different ones.
Since she is doubling the box it will be 2 times bigger
Answer:
4
Step-by-step explanation:
16/4
MN + NP = MP
6x - 7 + 2x + 3 = 60
8x - 4 = 60
8x = 64
x = 8
MN = 6(8) - 7 = 56 - 7 = 49
answer
x = 8
MN = 49