1/3 a number increased by 10 times by that same number
The phrase a number means an arbitrary variable, let's call it x.
1/3 a number
1/3 * x = x/3
That same number means the same arbitrary variable as above:
x
10 times that same number:
10x
The phrase increased by means we add:
x/3 + 10x
The phrase a number means an arbitrary variable, let's call it x.
1/3 a number
1/3 * x = x/3
That same number means the same arbitrary variable as above:
x
10 times that same number:
10x
The phrase increased by means we add:
x/3 + 10x