Answer: [tex]\frac{21}{16}\ cups\ of\ sugar\approx1.3\ cups\ of\ sugar[/tex]
Step-by-step explanation:
Let be "x" the cups of sugar needed for a full batch of brownies.
You need to analize the information provided in the exercise.
Since Henry uses [tex]\frac{3}{8}[/tex] cups of sugar for [tex]\frac{2}{7}[/tex] batch of brownies, you can write the following proportion:
[tex]\frac{\frac{3}{8}}{\frac{2}{7}}=\frac{x}{1}[/tex]
Finally, you must solve for "x".
Therefore, you get the following result:
[tex]x=\frac{21}{16}\ cups\approx1.3\ cups[/tex]