book Maths Puzzle Numerical Ability

Solve the system by the substitution method.

4x+y=16
16x+4y=64

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book Other Question

Vent Grill The Newbury Elementary School needs a new air vent drilled into the wall of the maintenance room. The circular hole that is necessary will have a radius of 6 inches. The find teh giometric mean of 5 and 6