The two college entrance exams in the US are the SAT and the ACT. Colleges weigh the two tests equally, so you can take either. The SAT is generally easier in the math section and has a harder english/ reading section, while the ACT has an easier english/ reading section and a harder math section. So basically, take the ACT if you are good at math and science, and take the SAT if you are good at reading. Hope this helps :)
If he is 4 now is in 10 years he will be 14 and if you multiply that by 2 you get 28 which means in 10 years Marie will be 28 so that means if you take away 10 the answer should be 18 but that isn't there but that's how I would work it out.
