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Maths Puzzle
Numerical Ability
If 4aČ-bČ=54, then 4(2a+b)(2a-b)= ?
Thanks.
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(1) 2x+y=5
I am at a lost
6-y/y+4=4/4+y
6- y 4
___ = ____
y+4 4+y
and how do I check