7. How much alcohol must be added to 480 grams of hand sanitizer that is 24% alcohol to make it a hand sanitizer that is 40% alcohol? Correct your answer to the nearest whole
number

the amount of alcohol to be added is 128 grams

Step-by-step explanation:

Given that:

The initial mass of the hand sanitizer = 480 grams

The initial strength of the hand sanitizer = 24 %

The new strength of the hand sanitizer = 40%

The objective here is to determine the final amount of alcohol that is to be added to get the new strength of the alcohol

First; let's find the mass of alcohol in the initial hand sanitizer;

SO;

= 24  % of 480

= 115.2 grams

If y should represent the mass of the alcohol added to have 40%; we have

The new amount of the alcohol to be

The new amount of the hand sanitizer will be

∴

For the new strength of sanitizer:

40 % of (480 + y) = (115.2 + y)

Thus ; we can conclude that the amount of alcohol to be added is 128 grams

here the number -5 is all of the following except a rational number.

step-by-step explanation:

26 is 33.33% of 78

step-by-step explanation:

26 is what percent of 78?

26 is p% of 78

equation: y = p% * x

solving our equation for p

p% = y/x

p% = 26/78

p = 0.3333

convert decimal to percent:

p% = 0.3333 * 100 = 33.33%