Write the recurring decimal 0.1 as a fraction in its simplest form

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. after tax the total is 45.99. what percentage of the subtotal is the total?

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)