Logical Reasoning Flashcards

Five friends P, Q, R, S, T sit in a row. Q is at the leftmost position. P sits immediately to the right of Q. T sits between P and S. R sits to the left of S. Who sits in the middle (3rd position)?

Answer: T

Placing Q first, P second, then T between P and S, and R left of S gives the order Q, P, T, R, S, placing T in the middle.

In a class, Ravi is 7th from the top and 28th from the bottom. How many students are in the class?

Answer: 34

Total students = position from top + position from bottom − 1 = 7 + 28 − 1 = 34.

All flowers are beautiful. Rose is a flower. Which conclusion definitely follows?

Answer: Rose is beautiful

Since all flowers are beautiful and Rose is a flower, it logically follows that Rose must be beautiful.

A clock shows 3:15. What is the angle between the hour and minute hands?

Answer: 7.5°

At 3:15 the minute hand is at 90° and the hour hand is at 3×30° + 15×0.5° = 97.5°, giving a difference of 7.5°.

If '+' means '×', '−' means '÷', '×' means '−', and '÷' means '+', what is the value of 8 + 4 − 2 × 3 ÷ 1?

Answer: 14

Substituting operators gives 8 × 4 ÷ 2 − 3 + 1; applying order of operations: 32 ÷ 2 − 3 + 1 = 16 − 3 + 1 = 14.

Complete the series: 1, 4, 9, 16, 25, ?

Answer: 36

The sequence is perfect squares (1², 2², 3², 4², 5²), so the next term is 6² = 36.

Statement: The production cost of solar panels has dropped by 80% over the last decade. Which assumption is implicit in this statement?

Answer: Solar panels were very expensive a decade ago

An 80% drop implies that the original cost was significant; the statement implicitly assumes solar panels were expensive before the decline.