Question

in class Mrs. Mcory started with 350 pieces of bubble gum if she now only has 105 piece by what percent did her bubble gum stash change

Answer 1

we need to find a value which multiplied by 350, give us 105. We can express this in an equation:

$350x=105\Rightarrow x=\frac{105}{350}=0.3$

then it changes in 100x0.3= 30 percent