Matt's protein powder is 80% protein.  He weighs 80 kg and wants to eat 2 grams of protein per kilogram of body weight each day.  How much protein powder does he need to eat per week?
He wants to eat 80*2=
<gadget id="calculator">80*2</gadget>
<output>160</output>
160 grams of protein a day.
That means he needs 160/.8=
<gadget id="calculator">160/.8</gadget>
<output>200</output>
200 grams of protein per day.
So he needs 200*7=
<gadget id="calculator">200*7</gadget>
<output>1_400</output>
1400 grams per week.

<result>1_400</result>