Tina is twice as old as her cousin sally their ages combined are 21 how old is each girl?

Oh, dude, math time! So, if Tina is twice as old as Sally, we can call Sally's age "x." That means Tina's age is 2x. Together, their ages add up to 21, so x + 2x = 21. Solve that, and you'll find Sally is 7 and Tina is 14. Math is fun, right?