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In a group of 45 students, 22 can speak Hindi only and 12 can speak English only. If (2lambda+1) student can speak both Hindi and English, the value of lambda is

The numbers of students speaking English and Hindi are in the ratio of 4:5. If the number of students speaking English increased by 35% and that speaking Hindi increased by 20% , what would be the new respective ratio?

In a group of 950 persons,750 can speak Hindi and 460 can speak English.Find: How many can speak both Hindi and English.How many can speak English only.How many can speak Hindi only