Answer:
11 students brought both a pen and a pencil
Step-by-step explanation:
59 students brought a pen or pencil or both
48 + 22 = 70
70-59 = 11
they ran 5 and 2 and half hour
r = 1.9
7r + 7 = 20.3
<u> - 7 - 7 </u>
7r = 13.3
divide by 7