Find the number if 12.5% is 7.5. What percentage is the number 24 of the number 129.

1. Let’s represent the original number as x, then we get the proportion:
x = 100%,
7.5 = 12.5%.
Now let’s use the “cross” rule and get an equation of the form:
2.5x = 7.5 * 100,
2.5x = 750.
Divide 750 by 2.5 and get x value:
x = 750 / 2.5,
x = 300.
Answer: the unknown number is 300.

2. First, define 1% of 129, dividing it into 100 parts:
129/100 = 1.29.
Now you need to divide the number 12 by 1.29, then we find out how many percent is the number 24 of 129:
24 / 1.29 = 18.26 / 43%.
Answer: the number 24 is 18/26/43% of the number 129.