Explanation:Let’s solve the given letter series:
Series:
`A _ _ B D _ C E B _ _ C E B _`
We need to fill in the blanks with a 6-letter sequence from the options to complete a repeating pattern.
—
✅ Step-by-step:
Let’s look at the repeating part at the end:
`C E B` appears three times (once fully, once starting from the 7th letter, and at the end).
So we can suspect that the pattern is repeating around:
A \_ \_ B D \_ C E B → Seems like one unit?
Try Option: CDAEAD
Place it into the blanks:
`A C D B D A C E B E A D C E B`
Check if the pattern makes sense:
* A C D B D A → Then comes C E B
* E A D → Then again C E B
This does not match cleanly.
—
Try Option 3: CADADE
Insert into the blanks:
`A C A D B D E C E B A D C E B`
Check pattern:
* First segment: `A C A D B D E`
* Then `C E B`
* Then `A D`
* Then `C E B`
Seems confusing — doesn’t give clean repeating segments.
—
Try Option : CDADEA
Insert:
`A C D B D E A C E B D E C E B`
Now look at segments:
* A C D
* B D E
* A C E
* B D E
* C E B
No obvious repeat pattern.
—
Now try Option 1: C E A D A D

Insert into the blanks:
`A C E B D A C E B A D C E B`
Let’s break it:
* A C E
* B D A
* C E B
* A D
* C E B
There’s a clear repeating pattern: C E B
It appears fully and cleanly in all positions.
So the completed sequence becomes:
`A C E B D A C E B A D C E B`
Now observe:
* C E B appears in:
* Positions 2–4
* Positions 7–9
* Positions 13–15
This fits well.
—
✅ Final Answer: Option 1: C E A D A D ✅
Want a tip on how to spot patterns like this quickly in such sequences?

Explanation:Let’s solve this step-by-step using all the clues.
We have 8 people:
Manoj, Nitya, Varun, Pranay, Kali, Reva, Sarayu, Teena
All are sitting in a straight row facing North.
—
Step 1: Reva is 4th from the extreme right end
So we fix Reva at position 5 (counting from left to right):
“`
Positions: 1 2 3 4 5 6 7 8
Person: _ _ _ _ R _ _ _
“`
—
Step 2: Kali is 2nd to the left of Reva
So, Reva is at 5 → Kali is at position 3
“`
1 2 3 4 5 6 7 8
_ _ K _ R _ _ _
“`
—
Step 3: Teena sits to the immediate right of Kali → Teena is at position 4
“`
1 2 3 4 5 6 7 8
_ _ K T R _ _ _
“`
—
Step 4: There are 2 persons between Reva and Pranay
Reva is at 5 → Pranay can be:
* Position 2 (left of Reva): 5 – 2 – 1 = 2
* OR Position 8 (right of Reva): 5 + 1 + 2 = 8
Try placing Pranay at position 2
“`
1 2 3 4 5 6 7 8
_ P K T R _ _ _
“`
—
Step 5: Number of persons between Kali and Manoj = Pranay and Sarayu
From current placements:
* Kali at 3
* Pranay at 2
To balance distances, try:
* Manoj at 6 (3 → 6 = 2 people in between)
→ Then Sarayu must also be 2 away from Pranay → position 5 is Reva, so try position 4 (already T), or position 1
Pranay at 2 → Sarayu at position 1
Now we try:
“`
1 2 3 4 5 6 7 8
S P K T R M _ _
“`
So far:
* Reva (5), Kali (3), Teena (4), Pranay (2), Sarayu (1), Manoj (6)
Left to place: Varun, Nitya
—
Step 6: Sarayu is to the immediate left of Nitya
Sarayu is at position 1 → Nitya must be at position 2 ❌ But Pranay is already at 2
→ So Sarayu cannot be at 1
Backtrack: Pranay must be at position 8, not 2
→ Reva at 5 → Pranay at 8
→ 2 people between them: 6 and 7
Update:
“`
1 2 3 4 5 6 7 8
_ _ K T R _ _ P
“`
—
Step 7: Kali is at 3 → Manoj should be same distance from Kali as Sarayu is from Pranay
Try Manoj at 1 → Kali at 3 → distance = 1 person
Pranay at 8 → Sarayu must be at 6 (distance = 1)
Place:
“`
1 2 3 4 5 6 7 8
M _ K T R S _ P
“`
Now remaining: Varun, Nitya
—
Step 8: Sarayu is to the immediate left of Nitya
Sarayu at 6 → Nitya at 7
“`
1 2 3 4 5 6 7 8
M _ K T R S N P
“`
Now only position 2 is left → Varun goes there
Final arrangement:
“`
1 2 3 4 5 6 7 8
M V K T R S N P
“`
—
✅ Final Question: How many persons are to the left of Nitya?
Nitya is at position 7 → Persons to the left = positions 1–6 → 6 people
—
✅ Final Answer: Option 4: Six ✅
Want a visual shortcut for solving such arrangement puzzles quickly?

Explanation:We are told:
* A completes 12% of work in 15% of the total time.
* A and B work together for the entire time, and finish 100% of the work.
* Need to find: How much work was done by B?
—
✅ Step 1: Find A’s work rate
If A does 12% in 15% of the total time, then:
* A’s work rate = units of work per unit time (i.e., A can do 0.8% of work per 1% of total time)
—
✅ Step 2: A’s total contribution in 100% time
If A works the entire time, i.e., 100% of the allotted time:

—
✅ Step 3: Work done by B
Total work = 100%
A did 80%, so:

—
✅ Final Answer: Option 2: 20% ✅
Want a quick tip on solving similar time-work questions using ratios?