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325%
0.325
3:00 - 0:35 = 2:25
1+2=3 1+2+3=6 1+2+3+4=10 1+2+3+4+5=15 1+2+3+4+5+6=21 ...etc... 1+2+......+24+25=325. Another approach is: Sum=(25+1)*25/2=325.
75 = 25 x 325 is a square number: 5² = 25, so ( √75 ) = (√5²)(√3) = 5√3