Explanation

To find 20% of 50% of 80:

First, find 50% of 80:

50% of 80 = (50/100) * 80 = 0.5 * 80 = 40

Then, find 20% of 40:

20% of 40 = (20/100) * 40 = 0.2 * 40 = 8

So, 20% of 50% of 80 is 8.

 Last updated on 12 NOV 2026

Explanation

In the Tree of Rumour problem, one person passes the rumour to 2 other people every 5 minutes.

Therefore, the total number of people triples every 5 minutes.

0 minutes → 1 person

5 minutes → 3 persons

10 minutes → 9 persons

15 minutes → 27 persons

20 minutes → 81 persons

Using the formula:

3^20/5 =3^4 =81

 Last updated on 12 NOV 2026

Explanation

Let's calculate the population after 2 years:

Year 1:

Population = 50,000 + (4% of 50,000)

= 50,000 + 0.04 * 50,000

= 50,000 + 2,000

= 52,000

Year 2:

Population = 52,000 + (4% of 52,000)

= 52,000 + 0.04 * 52,000

= 52,000 + 2,080

= 54,080

The population after 2 years will be 54,080.

 Last updated on 12 NOV 2026

Explanation

Series: 2, 5, 10, 17, 26, 37, 50, 64

(1 × 1) + 1 = 2

(2 × 2) + 1 = 5

(3 × 3) + 1 = 10

(4 × 4) + 1 = 17

(5 × 5) + 1 = 26

(6 × 6) + 1 = 37

(7 × 7) + 1 = 50

(8 × 8) + 1 = 65 (not 64)

Odd one: 64

Last verified on 11-11-2026

Explanation

2 + 3 = 5

5 + 7 = 12

12 + 11 = 23

23 + 15 = 38

38 + 19 = 57

57 + 23 = 80

Last verified on 31-03-2026