So 1/5 pound for 7 days 1/5 <span>÷ 7 rewrite the 7 as a fraction of 7/1 1/5 </span><span>÷ 7/1 keep the first fraction, change the division sign to multiplication, flip the second fraction 1/5 * 1/7 multiply across (1 * 1) / ( 5 * 7) 1/35
She should</span><span> eat 1/35 of a pound each day to make her 1/5 of a pound last a week, or seven days.