Commuters 2428

A total of 750 pupils attend the school. 20% of students are commuters. 18% of pupils commute in the first grade and 23% in the second grade. How many first graders does the school have?

Final Answer:

x =  450

Step-by-step explanation:

r1=20%=10020=51=0.2 r2=18%=10018=509=0.18 r3=23%=10023=0.23 n=750  x+y= n r2  x+ r3  y = r1  n  r2 x+r3 (nx)=r1 n 0.18 x+0.23 (750x)=0.2 750  0.05x=22.5  x=0.0522.5=450  x=450



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