Buxoro davlat universiteti




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2.3.10-masala.Ikki har xil mis qotishmasi bor.Birinchi qotishmadagi misning prosenti ikkinchi qotishmadagi misning prosentidan 40 ta kam.Ikkala qotishmani qo`shib eritib,36% mis bo`lgan qotishma hosil qilindi.Birinchi qotishmada 6 kg,ikkinchi qotishmada 12 kg mis borligi malum bo`lsa,birinchi qotishmada necha prosent mis bo`lgan?

A)10% B)15% C)20% D)25%



Yechish:Birinchi qotishmada x% mis bo`lsa, ikkinchi qotishmada (x+40)% mis bo`ladi.Birinchi qotishmaning og`irligi kg,ikkinchi qotishmaning og`irligi kg. Ushbu

tenglamani hosil qilamiz.

12(x+40)+24x=x(x+40), 12x+480+24x=x2+40x, x2+4x-480=0,



, (chet ildiz).

Demak, birinchi qotishmadan 20% mis olingan.Javob:C





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