Answer:
120
Step-by-step explanation:
So 10% of a number (let's use n) is 30.
The key word "of" tells us we need to multiply. Therefore, 10% times n is 30:
[tex]10\%(n)=30[/tex]
10% is the same as 0.1. So:
[tex]0.1n=30[/tex]
Divide both sides by 0.1:
[tex]n=300[/tex]
So, our number is 300.
To find 40% of 300, multiply 0.4 and 300. Thus:
[tex].4(300)=120[/tex]
Our answer is 120.
And we're done!
