x-y=6

x=6y

X=7.2，y= 1.2。

So x+y=8.4.

2.

It turns out that the two boxes are the same.

A sells for 7 kilos.

B sold 19 kg.

A has more leftovers than B: 19-7 = 12kg.

At this point, A is three times that of B.

B Remaining: 12 ÷ (3- 1) = 6kg.

It turns out that Party A and Party B each have: 6+ 19=25 kg.

Let's assume that Party A and Party B each have X kilograms.

x-7=3(x- 19)

x-7=3x-57

3x-x=57-7

2x=50

x=25

4.

Solution: Assume that X hectares are actually harvested every day.

28*(X-7)= 18*X

Solution: X= 19.6

Answer: The actual daily harvest is 19.6 hectares.

5.

Assuming that these foods are for one person, the hotel prepares 30* 120=3600 servings.

After eating for five days, 30 people ate for five days and ate 30 * * * 5 = 150 portions.

Remaining =3600- 150=3450 copies.

There are 30 people here, that is, a * * *, 60 people.

Days =3450/60=57.5 days

So, it's enough for 57.5 days.

6:6. Pear 22 Apple 66