In a college, the ratio of foreign to local students is 3:7. If three-fourths of the local students are female and one-quarter of the foreign students are female, what fraction of the combined students is female?
Apu, Babu, and Tipu bought a football. Apu paid the largest amount of money, Tipu paid twice as much as Babu, and Babu paid the least. Apu paid Tk. 70 less than the difference between what Babu and Tipu paid. If Babu and Tipu had each paid Tk. 10 less, then Tipu would have paid twice the amount Babu paid. What is the price of the football?