If a spaceship fuel tank is 25 cm long and needs to be scaled up by 100 times, what will be its length in the actual spacecraft?

To determine the new length of the spaceship fuel tank after scaling it up by 100 times, you multiply the original length by the scaling factor. The original length of the fuel tank is 25 cm. When scaling this by 100, it involves straightforward multiplication:

25 cm × 100 = 2500 cm.

Now, we need to convert this length into meters, as the first choice suggests a length in meters. Knowing that 1 meter equals 100 centimeters, you convert the length:

2500 cm ÷ 100 = 25 m.

Thus, the length of the fuel tank, when scaled up by 100 times, is indeed 25 meters. This is why the answer is correct. The other choices do not accurately represent the length when calculated or converted properly, either being in the wrong units or not achieving the necessary scaling factor.