Question

is saving up to buy a new pair of headphones. He has $20 saved already, and he earns $10 for every lawn he mows. How many lawns will he have to mow to have at least $90 saved?

Answer 1

To determine how many lawns the student needs to mow to save at least $90, set up an inequality. With $20 already saved and earning $10 per lawn, the student needs to mow at least 7 lawns.

Step-by-step explanation:

The question is asking how many lawns a student needs to mow to save at least $90 if he has $20 already and earns $10 for every lawn mowed. This is a basic algebra problem where we can set up an equation to solve for the unknown, which is the number of lawns that need to be mowed.

Let's define the number of lawns that need to be mowed as L. The student has $20 already, so we add this to the total earnings from mowing lawns, which is $10 multiplied by L (10 times the number of lawns mowed). This total needs to be at least $90, as stated in the problem. Therefore, we can set up the following inequality:

20 + 10L ≥ 90

To solve for L, we first subtract 20 from both sides of the inequality:

10L ≥ 70

Next, we divide both sides by 10 to isolate L:

L ≥ 7

Therefore, the student must mow at least 7 lawns to have $90 saved.