A typical human newborn weighs 150lbs, while a newborn weighs approx 7lbs. An adult Western grey Kangaroo weighs about 30 kilograms and gives birth to babies who are approx 1 gram. If human babies were proportionally the same weight to adults as Western grey kangaroo babies, how much would a human newborn weigh?

Please proofread your question and repost.

that is word for word what the questions says. It also says that there is one number in the problem that you do not need for the ratio and that it confuses students. Also a reminder that there is 1000g in one kg

1g/30kg = x/150 lb

.001/30 = x/150
x = .005 lb = 0.08 oz

pretty tiny!
It doesn't matter what a newborn human weighs. We're figuring the weight ratio using the kangaroo.

I kept doing 7/150. thanks for all your help, both of you!!

To find out how much a human newborn would weigh if their weight was proportional to that of a Western grey kangaroo baby, we need to calculate the proportional weight ratio between the adult kangaroo and its baby, and then apply that ratio to a human adult-to-newborn ratio.

First, let's calculate the weight ratio of the adult kangaroo to its baby:
1 kilogram (kg) = 1000 grams (g)
So, the adult kangaroo weighs 30 kg, or 30,000 g.
The baby kangaroo weighs 1 gram (g).

Ratio = Adult weight / Baby weight
Ratio = 30,000 g / 1 g
Ratio = 30,000

Now, let's apply this ratio to a human adult-to-newborn ratio:
Typically, the weight of a human adult is around 150 lbs (pounds), which we can convert to grams:
1 lb = 453.59 grams (approximately)
So, the weight of a human adult is 150 lbs * 453.59 g/lb ≈ 68,039 g.

Using the calculated ratio of 30,000, we can find the weight of a human newborn:
Human newborn weight = Human adult weight / Ratio
Human newborn weight = 68,039 g / 30,000
Human newborn weight ≈ 2.27 g (rounded to two decimal places)

Therefore, if human babies were proportionally the same weight to adults as Western grey kangaroo babies, a human newborn would weigh approximately 2.27 grams.

hey