#### Solution for 15 is what percent of 21:

15: 21*100 =

( 15*100): 21 =

1500: 21 = 71.43

Now we have: 15 is what percent of 21 = 71.43

Question: 15 is what percent of 21?

Percentage solution with steps:

Step 1: We make the assumption that 21 is 100% since it is our output value.

Step 2: We next represent the value we seek with {x}.

Step 3: From step 1, it follows that {100\%}={ 21}.

Step 4: In the same vein, {x\%}={ 15}.

Step 5: This gives us a pair of simple equations:

{100\%}={ 21}(1).

{x\%}={ 15}(2).

Step 6: By simply dividing equation 1 by equation 2 and taking note of the fact that both the LHS
(left hand side) of both equations have the same unit (%); we have

\frac{100\%}{x\%}=\frac{ 21}{ 15}

Step 7: Taking the inverse (or reciprocal) of both sides yields

\frac{x\%}{100\%}=\frac{ 15}{ 21}

\Rightarrow{x} = {71.43\%}

Therefore, { 15} is {71.43\%} of { 21}.

#### Solution for 21 is what percent of 15:

21: 15*100 =

( 21*100): 15 =

2100: 15 = 140

Now we have: 21 is what percent of 15 = 140

Question: 21 is what percent of 15?

Percentage solution with steps:

Step 1: We make the assumption that 15 is 100% since it is our output value.

Step 2: We next represent the value we seek with {x}.

Step 3: From step 1, it follows that {100\%}={ 15}.

Step 4: In the same vein, {x\%}={ 21}.

Step 5: This gives us a pair of simple equations:

{100\%}={ 15}(1).

{x\%}={ 21}(2).

Step 6: By simply dividing equation 1 by equation 2 and taking note of the fact that both the LHS
(left hand side) of both equations have the same unit (%); we have

\frac{100\%}{x\%}=\frac{ 15}{ 21}

Step 7: Taking the inverse (or reciprocal) of both sides yields

\frac{x\%}{100\%}=\frac{ 21}{ 15}

\Rightarrow{x} = {140\%}

Therefore, { 21} is {140\%} of { 15}.

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