If n and p are both odd number, which of the following is an even number

You can do this by converting this into a ratio or a fraction

Ratio:
1 lb for 4 guinea pigs
1:4
If he was 8 lbs for x guinea pigsit would be

1:4
8:x

Multiply the first ration until the one is equal to 8, then whatever the four turns into is x

Fraction: (easier way)

1/4 (1lb for 4 guinea pigs)
8/x (8lb for x guinea pigs)
1/4 = 8/x
Multiply one until it is equal to 8
Correspond that to the 4

1*8 = 8
4*8 = 32

32 guinea pigs