**Question 30:**

- The machine manufactures 20 cans/hr, which implies 40 cans in 2hrs
- 10 cans/box implies 4 boxes for the 40 cans
- Maria packs at a rate of 3boxes/hr, (3boxes/60mins)
- Therefore 1 box would be packed in 20mins, which follows that 4 boxes would be packed in 4*20 = 80 mins

**Option C**

**Question 22:**

Let the woman’s salary = X

Rent = (5/8)X

Food = 1/3 of remainder after rent

remainder = (1-(5/8))X

therefore Food = 1/3(1-5/8)X = 1/3(3/8)X = (1/8)X

Representing the information as an equation

(5/8)X +(1/8)X + $40 = X

multiply through by 8

5X + X + $320= 8X

Collecting like-terms:

2X = $320

X = $160

**Option A**

(1) Cans manufactured/ hour = 20 cans

Therefore, cans manufactured in 2 hours = 40 cans (20*2)

(2) Cans packed/ box = 10 cans/box

And boxes packed by Maria in 1 hour = 3 boxes

(Minutes for packing 1 box = 20 minutes) (60 minutes/3 boxes)

Therefore, cans packed in 1 hour = 30 cans (10*3)

Cans remaining = 10 cans (Total Cans - Cans packed in 1 hour)

Thus, 1 box takes 20 minutes, Therefore, 60 minutes +20 minutes = 80 minutes