Percentage = (18 ÷ 60) × 100 = 30%.
Last verified on 19-04-2026
Total students = 50 + 40 + 30 + 20 = 140
Passed students:
Section 1: 50 _ 20% = 10
Section 2: 40 _ 15% = 6
Section 3: 30 _ 30% = 9
Section 4: 20 _ 50% = 10
Total passed = 10 + 6 + 9 + 10 = 35
Pass % of whole class = 35 / 140 * 100 = 25%
Failure % = 100% - 25% = 75%
Last verified on 20-10-2026
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
Convert 1.15 into percentage:
Multiply by 100:
1.15 × 100 = 115%
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
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