Abox of pens contains only red pens and blue pens. the ratio of the number...
Option B. For every 5 red pens, there are 15 blue pens.
The statement expressed the ratio of the red pens to the total as 1 : 4.
This means that for every red pen in the box, there are 4 blue pens.
So, statement A is correct.
Let's skip B an look at other statements as well:
For C, the ratio will be 15 : 60 which translates to 1 : 4. So C is true.
Let's look at D.
This is an interesting one. The problem defines 18 as blue. So it means that 24 - 18 = 6
6 pens will be blue. Again 6 : 24 gives us 1 : 4. So D is true.
B gives us 5 : 24 which is not true.
its 60-10+x why, because she bought the dress with $60 and she received $10 dollars back. We don't know the variable.
48/40 = 1 8/40
1 8/40 Simplify to 1 1/5
Hope this helps!