Answer: N=1.25
Step 1: Simplify both sides of the equation.
(0.3)(0.5)=0.4−0.2n
0.15=0.4+−0.2n
0.15=−0.2n+0.4
Step 2: Flip the equation.
−0.2n+0.4=0.15
Step 3: Subtract 0.4 from both sides.
−0.2n+0.4−0.4=0.15−0.4
−0.2n=−0.25
Step 4: Divide both sides by -0.2. -2.0n/-0.2 = -0.25 / -0.2
Which then gives you N= 1.25
