Answer:
45 students speak Spanish at Francis Lewis High School
Step-by-step explanation:
Option1:

18000 = 400x
x = 45 students speak Spanish at Francis Lewis High School
Option2:
72 ÷ 400 = 0.18
0.18 * 250 = 45 students speak Spanish at Francis Lewis High School
Answer:
See the attached pictures for answer.
Step-by-step explanation:
See the attached picture for detailed explanation.
Answer:
15
Step-by-step explanation:
Take 62.5 from 100 = 37.5
divide this by 100 = 0.375
times 40 by this
0.375 x 40 = 15
If Nate paints the wall in 4 hours, it means that he can paint 1/4 of the wall every hour.
Similarly, if Jill paints the wall in 7 hours, it means that he can paint 1/7 of the wall in one hour.
So, together, they paint the following fraction of the wall in one hour:
.
At this rate, they need 28/11 hours to paint the whole wall, in fact, after that amount of time they paint

i.e. the whole wall