Twenty four is less than eight fifths of a number x

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?

Fast! find the length of cu. the triangles are similar. show your work.