Others Maths Puzzle Logical Reasoning Cryptography

SCOOBY+DOOO=BUSTED;

FIND & DESCRIBE THE VALUE OF B+U+S+T+E+D ?

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Others Other Question

1000student has individual locker. First student opens all lockers and second student closes all even number of lockers . Similarly 3rd students goes to 3rd number of locker like 3 6 9 12 upto 999. similarly forth goes to 4 table number like 4 8 12 16 up to 1000. thus all 1000 students go to their respectively lockers and they open all if they find closeotherwise they close if they find open. So you have to tell that afterlast student how many lockers will open. Which of the following is prime number?
a)31
b)61
c)71
d)91