21 is 70% of what number
if the number is X, then 70 % of the number X has a value of 21.
then we can write it as an equation as follows
X 70 % = 21
since 70% is equivalent to 0.7
X 0.7 = 21
X = 21 / 0.7
X = 30
therefore number is 30
Answer:
30 is the number which gives 21 when taking 70% of 30 i.e 70% of 30 is 21
Step-by-step explanation:
Let x be the number which gives 21 when taking 70% of the number x.
We have to find the value of x.
∴ According to question
\(70\% of x=21\)
⇒ \(\frac{70}{100}\times x=21\)
⇒ \(x=\frac{21\times 100}{70}\)
⇒ \(x=30\)
Hence, 30 is the number which gives 21 when taking 70% of 30 i.e we can say 70% of 30 is 21