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In a row of 50 books, Book A is 15th from left and Book B is 20th from right. How many books lie between them?

A17

B15

C12

D10

Answer:

B. 15

Read Explanation:

Total books = 50

  • Book A is 15th from the left.

  • Book B is 20th from the right.

Position of Book B from the left:

(50 - 20 + 1 = 31)

So, Book A is at position 15 and Book B is at position 31.

Books between them:

(31 - 15 - 1 = 15)

Therefore, 15 books lie between them.

Related Questions:

Direction: Two statements are followed by three conclusions I, II, and III. Assuming these statements to be true, even if they seem to be at variance from commonly known facts, then decide which of the given conclusions logically follows from the given statements.
Statement: 
All Springs are brooks.
Some brooks are creeks.

No creek is tap.
Conclusions: 
I. Some taps are creeks.
II. No spring is tap.
III. Some brooks are springs

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusion(s) logically follow(s) from the statements. Statements: All doors are walls. All walls are floors. Conclusions: (I) All floors are walls. (II) Some floors are doors.
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements. Statements: All balloons are mangoes. All balloons are foams. Conclusions: (I): Some mangoes are foams. (II): All foams are balloons.
Read the given statements and conclusions carefully. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. You have to decide which conclusion/s logically follow/s from the given statements. Statements: All fans are doors. All doors are bags. No fan is a light. Conclusions: I: No door is a light. II: No bag is a light.

Instruction: Identify the assumptions that must hold for the statement to be valid, then choose the correct option.

Statement: Deforestation in tropical rainforests, primarily driven by agricultural expansion and logging, not only contributes to the loss of biodiversity but also exacerbates global warming by reducing the Earth's capacity to absorb carbon dioxide.

Assumptions:

I. Deforestation reduces the Earth's ability to absorb carbon dioxide.

II. Agricultural expansion and logging are the primary causes of deforestation.

IlI. The loss of biodiversity is the most significant consequence of deforestation.