if a number x is 10%of y and z,and z is 3 times of y.What % is x of y alone? 1)3.3% 2)2.5% 3)5% 4)4%

z = 3y

x = .1(y+z) = .1(y+3y) = .1(4y)

Take it from there.

i don't understand what is x of y alone ,

It is the relationship of x to y with z factored out.

To find the percentage of x in terms of y alone, we can use the information given in the question.

Let's break down the problem step by step:

1. Suppose x is 10% of y and z. Mathematically, this can be written as:
x = 0.1y (since x is 10% of y)

2. It is also given that z is 3 times y. Mathematically, this can be written as:
z = 3y

3. We need to find what percentage x is of y alone. Let's call it p.

So, p% of y = x.

4. To solve for p, we can rearrange the equation from step 1:
x = 0.1y
Divide both sides of the equation by y to get:
x/y = 0.1

5. Now, let's simplify the equation by dividing both sides by 0.1:
(x/y) / 0.1 = 1

6. Using the information from step 2, we can substitute z for 3y:
(x/z) / 0.1 = 1

7. Solving the equation, we find:
x/z = 0.1

8. Since z = 3y (from step 2), we can substitute z with 3y:
x/(3y) = 0.1

9. Now, let's solve for x/y alone by multiplying both sides of the equation by y:
(x/y) * (1/y) * y = 0.1 * y
x/y = 0.1 * y

10. So, we can conclude that x is 0.1 times y, which means x is 10% of y alone.

Therefore, the correct answer is 10%, which is not listed among the options provided.