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287+534=821 szkoły średnie
2348 ---- 100%
821----- x
2348x = 82100 / : 2348
x= 35 w przybliżeniu
821 to szkoły średnie (x)
2348=100%
821=x
2348x=82100%
x=82100/2348
x=34,97≈35%