Average = middle term = 24. Numbers = 20, 22, 24, 26, 28. Smallest = 22.

Faster car’s speed = 300/3 = 100 km/h. Slower = 100 × 4/5 = 80 km/h. Time = 300/80 = 3.75 ≈ 4 hours.

If it doubles in 8 years, the interest earned = principal. To triple, interest = 2× principal. So time = 8 × 2 = 16 years.

Babbage proposed the Analytical Engine, which inspired modern computing architectures.

In most conductors, higher temperature increases atomic vibrations, which hinder electron flow and raise resistance. (But in semiconductors, it’s the opposite — resistance drops!)

The watt measures the rate of energy conversion or power in an electrical circuit.

CAD software helps engineers design parts and assemblies digitally before production.

Linus Benedict Torvalds is a Finnish software engineer who is the creator and lead developer of the Linux kernel

In 9 years, father will be 45 and son will be 15. 45 is 3 times 15.

These are prime numbers. 13 is the next prime after 11.

Each machine makes 1 widget in 5 minutes. So 100 machines will make 100 widgets in 5 minutes, working in parallel.

A capacitor stores energy in the form of an electric field between its plates. It doesn't store current or voltage directly.

"Obscure" means unclear or hidden. Its opposite is clear.

The correct preposition after "good" (when talking about skill) is "at".

The pattern is +4, +6, +8, +10, +12... So, 30 + 12 = 42