Final answer:
To find the percent of a number, set up a proportion and solve. 27 is 67.5% of 40, 95% of 20 is 19, and 0.5% of 490 is 2.45.
Step-by-step explanation:
To find what percent of 40 is 27, you can set up a proportion.
Let x represent the percent:
x/100 = 27/40
Cross multiplying, we get:
40x = 27 * 100
x = (27 * 100) / 40 = 67.5
So, 27 is 67.5% of 40.
Similarly, to find 95% of a number, we set up another proportion:
95/100 = 19/x
Then, cross multiplying:
95x = 100 * 19
x = (100 * 19) / 95 = 20
Therefore, 95% of 20 is 19.
To find 0.5% of 490, you can set up a proportion:
0.5/100 = x/490
By cross multiplying, we get:
100x = 0.5 * 490
x = (0.5 * 490) / 100 = 2.45
So, 0.5% of 490 is 2.45.
Learn more about Finding the percent of a number