Jenny has $25 and earns $10 for each lawn that she mows.

Jenny wants to buy a concert ticket that costs $115.

Enter the minimum number of lawns Jenny needs to mow

to be able to buy the concert ticket.

9 lawns

Step-by-step explanation:

If she already has $25 of the $115 dollars needed for the ticket, she only needs to make $90 more. If she makes $10 each lawn, she would need to mow 9 lawns in order to get the $90 dollars.