Non-Bratislava 67034

50% of 9th graders of our Bratislava school are non-Bratislava pupils. One-third of them commute by bus, a fifth by bike, and seven pupils walk. How many students are in the 9th grade?

Correct answer:

n =  30

Step-by-step explanation:

q=50%=10050=21=0.5  q 3n+q 5n+7=q n 0.5 3n+0.5 5n+7=0.5 n  0.5 n/3+0.5 n/5+7=0.5 n  3.5n=105  n=3.5105=30  n=30

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