If the ratio of 5a to 2b is 1/10 what is the ratio of a to b?

If 20% of a number is 35, what is 50% of that number?

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Formulate alisha has a number in mind. if she adds three to her number the result is less than five. use this information to write and solve an inequality about alisha's number. then graph the solution set.