To go on the class trip, Chang needs at least $125. He has saved $45, and he makes $7 an hour at his job.
What is the minimum number of complete hours he must work to have enough money to go on the trip? (Assume there are no withholdings from his check.)
10 hours
11 hours
12 hours

Question

To go on the class trip, Chang needs at least $125. He has saved $45, and he makes $7 an hour at his job.
What is the minimum number of complete hours he must work to have enough money to go on the trip? (Assume there are no withholdings from his check.)
10 hours
11 hours
12 hours

callisto · Answer

Let x be the hours he needs to work.
$$45+7x\ge 125$$
Can you solve it

anonymous · Answer

ill try

callisto · Answer

Note: 7x is the amount he earns through working
         45 is the money he saved 
         125 is the sum of money he needed

anonymous · Answer

12 because its more

callisto · Answer

Can you show all your workings?

anonymous · Answer

45+7(12)=129

callisto · Answer

Hmm... I don't think should do in this way :|
Actually, it is like this:
$$45 +7x \ge 125$$$$7x \ge 125 -45$$$$7x \ge 85$$$$7x \ge 80$$$$x \ge 11.429$$
Therefore, the minimum hours required is 12