exam Maths Puzzle Numerical Ability

PLEASE HELP NOT SURE HOW TO SOLVE! a=1/2(b+B)for B

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exam Other Question

Jasmin is walking a group of 6 dogs. In how many different orders can the enter her house in single file to get a drink of water?

A. 21 B. 40 C. 480 D. 720 log base 2 (x+5) + log base 2 (x+2) = log base 2