Math Question

it works just like equations

but if you multiply by -1 or negative number , it inverses

so you just need to subtract 15

15+n<25

n<10

so all solutions for this inequality are under 10 

the biggest integer who satisfy this equation is 9 

just solve it like equations rule

but don't forget when you are multiplying by negative number

or squaring negative numbers

15 + n < 25 subtract 15 from both sides

n < 10