Answer:
30b ≤ 120
or
30b + 70 ≤ 190
Explanation:
let b be the packs of bulbs.
Since they already spent $70 on their budget, deduct the budget.
190 - 70 = $120
$30 for b
and it can't be more than the budget.
So,
30b ≤ 120
Note:
If this answer is wrong,
then include the $70 in the equation.
30b + 70 ≤ 190