Answer: 45 teaspoons of cinnamon
Step-by-step explanation
First, set up a proportion:
=
Next, do cross multiplication:
1.5 · 60 = 2x
90 = 2x
Now, solve like a normal equation:
90/2 = 2x/2
45 = x
Check your answer:
1.5/2 = 45/60
0.75 = 0.75
With this information, we now know that 45 teaspoons of cinnamon are needed to make 60 oatmeal cookies.