The answer is D $126,if three cost $54 that means one costs $18 and just multiply it with seven
The right ans is D.I am 100%sure.
if my ans was gelpful u can follow me.
The external angle is equal to the sum of the opposite internal angles.
.. 6x +1 = (2x +10) +79
.. 4x = 88 . . . . . . . . . . . . . subtract 2x+1
.. x = 22
When you lay them out then you know what you are dividing