At the library you find 9 books on a certain topic. the library and tell you that 55% books on this topic have been signed out how many books does the library have on this topic

Firstly, you should find 10% of 9, which is 0.9 You've then got to multiply this by 5.5, as you've got 55 books. 0.9x5.5= 4.95 Therefore, as you cannot have .95 of a books, this has to be rounded to 5. Therefore, the library has 5 books out on the topic. Hope this helps :)

To get the answer we have to find 55% of 9.
First step is rewrite 55% as 0.55
Second and the last step is to multiply 0.55 times 9
0.55*9=4.95~=5 -its the answer

2,4,5,8,10 are divisible by 40

You didn’t put the necessary image to solve the question : p