Ms Lawnsword calculated that two different fields need the following amounts of hay meadow seed. Field1 needs 400 grams,
Field 2 needs 1600 grams.

She wrote down the
formulae for calculating the number of bags as follows...

1. Number of bags for Field1 = Field1 amount / amount in a bag

2. Number of bags for Field2 = Field2 amount / amount in a bag

3. Total number of bags of seed = Number of bags for Field1 + Number of bags for Field2

Her son says this is incorrect and she should use the following
formulae...

1.
Total seed amount = Field1 amount + Field2 amount

2. Number of bags of seed = total seed amount / amount in a bag

**Who is correct? **