If we let x represen . . . . eh, scratch that; everyone uses x so let's use b (you know, for books). If we let b stand for how have books Ramon has, then the if Jason has 1 1/2 times as much, he would 1.5×b,or just 1.5b. Together means you add them up (so 1.5b + b) and you get 45 -----> So 1.5b + b = 45.
Now just add the like terms (remember that b = 1b if that helps) and then solve the equation by dividing and that should give you the answer. Well, to be precise, that will give tell you what b is, which is how many books Ramon has. You will then have to multiply that number by 1.5 to get how many Jason has.
I hope this helps. Have a great day!