exam Maths Puzzle Numerical Ability

how do you solve equations with variables on both sides?

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exam Other Question

A right pyramid has a square base that measures 10cm on each side. It's peak is 12cm above the center of it's base. What is the sum of the lengths of the pymramid's eight edges? Ex carbon-11 decaays at the rate of 3.5% per minute. assume that 100% is present at time 0 min.
a. what percentage remains after 1 min?
b. write the equation that expresses