Question

2n +7 is greater than or equal to 27 or 3+3n is less than or equal to 30. What is n?

Answer 1

this is written as

$2n + 7 \geqslant 27$

change the greater than or equal to sign to equal to in order to solve it

thus

$2n + 7 = 27$

$2n = 27 - 7$

$2n = 20$

dividing through by 2

$\frac{2n}{2} = \frac{20}{2}$

$n = 10$

{${n:n \geqslant 10}$}