2x+x-7+3x-20=87cm
6x-27=87
6x=114
x=19
Therefore the sides are:12cm, 38cm, and 37cm
The answer to 25. is A
and
to 26. is C (I'm not sure on this one but i think this is the answer)
Asuming they started summer at the same time. The logical answer will be none, because it will take at least 165 days for the lcd(5) to overlap and there is not 165 days in a summer.
so it will be a rate of 1 for every 5 times Antonia went to the beach.