Question

Each month for 7 months, Samuel mows 3 lawns. How many more lawns does he need to mow before he has mowed 29 lawns.

I think it is 8 more lawns and not 7.
7x3=21; 29-21=8.

Am I wrong?

Answer 1

What I did is 7×3 and got 21 then counted up in till I got to 29 and I got 6 not 8.

Answer 2

Answer: No, He needs to to mow 7 more lawns before he has mowed 29 lawns.

Explanation:

Given: The number of lawns by Samuel in each month =- 3

The number of months he mowed the lawns = 7

Then, the number of lawns mowed by Samuel =
`7*3=21`

Let x be the number of lawns he needs to mow before he has mowed 29 lawns, then x<29

The number just before 29 is 28

Then,
`x=28-21\\\Rightarrow\ x=7`

Hence, he needs to to mow 7 more lawns before he has mowed 29 lawns.