Explanation

Distance per litre = 120 ÷ 6 = 20 km.

For 15 litres = 20 × 15 = 300 km.

Explanation

2500 × 12 = 30,000 rupees in a year.

Explanation

1500 × 12 = 18,000 rupees in a year.

Explanation

(25)² = 625

(2)⁰ = 1

625 × 1 = 625

Explanation

10 ships use 10 tanks in 10 days → that means all 10 ships together use 1 tank per day.

So, 1 ship uses 1/10 of a tank per day.

Therefore, to use 1 full tank, 1 ship needs 10 days.

Explanation

Explanation

Words per line = 10

Lines per page = 20 → 20 × 10 = 200 words per page

Pages = 40 → 200 × 40 = 8000 words in total

Explanation

Distance covered = 60 km in 5 hours.

So, speed = 60 ÷ 5 = 12 km/h.

Number of boats does not affect distance or speed.

So, in 1 hour, 3 boats (or any boats) will each cover 12 km.

Explanation

If A’s mother is the aunt of my daughter, she must be a sibling of one of the parents (me or my spouse).

Since I have no brother, the aunt is a sister — her child (A) is my niece/nephew, so Nephew (male child) fits.

Explanation

Morning reading time:

Pages read = 100 pages

Rate = 60 pages/hour

Time taken = Pages / Rate = 100 / 60 = 5/3 hours

Evening reading time:

Pages read = 100 pages

Rate = 40 pages/hour

Time taken = Pages / Rate = 100 / 40 = 5/2 hours

Total pages read:

100 pages (morning) + 100 pages (evening) = 200 pages

Total time spent reading:

5/3 hours + 5/2 hours = 10/6 + 15/6 = 25/6 hours

Average rate of reading:

Average rate = Total pages / Total time

Average rate = 200 pages / (25/6 hours) = 200 * (6/25) = (200/25) * 6 = 8 * 6 = 48 pages/hour