because school shirts need to be thick
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Black shirts absorb more and reflect less radiation.
According to my school 36
No : 152 = 225; 162 = 256 , 242 is in between 225 and 256. I had a high school math teacher who made us memorize the squares up to 25 square. It was one of the more useful things I did in high school.
Intraschool is within one school. Inter school among 2 or more schools.
Rocks are made of more than 1 substance