Question
A bag contains 30 white and some black balls. If the
probability of drawing a black ball from the bag is 1.4 times that of drawing a white ball, find the number of black balls in the bag.Solution
 Given, Number of white balls = 30 Let x be the number of black balls. Total number of balls in the bag = 30 + x Also, the probability of drawing a black ball from the bag is 1.4 times that of drawing a white ball. ⇒ x/ (30 + x) = 1.4[30/ (30 + x)] =5x = 7×30 ⇒ x = 42 Hence, the number of black balls in the bag = 42.
In a certain code language,
A + B means 'A is the brother of B'.
A - B means 'A is the father of B'.
A X B means 'A is the m...
'A@B' means 'A is the father of B'. 'A#B' means 'A is the sister of B'. 'A$B' means 'A is the brother of B'. 'A%B' means 'A is the wife of B'.
If...
- In the following expression: A ? B @ C $ D # E. What should come in the place of the question mark (?), to establish that A is the father of B?
If A # B means A is mother of B. A @ B means A is brother of B. A % B means A is sister of B. A $ B means A is father of B. In expression K # G $ L % I ...
Answer the following question based on the direction given below. If 'A#B' means 'A is father of B'. 'A@B' means 'A is brother of B'. 'A$B' means 'A is ...
If ‘P@Q’ means ‘P is the mother of Q’, ‘P$Q’ means ‘P is the husband of Q’, ‘P#Q’ means ‘P is the sister of Q’, ‘P*Q’ means...
In expression I @ P % K $ O @ G # N % F, how is P related to F’s sister?
Answer the following question based on the direction given below.
If 'A$B' means 'A is son of B'
'A%B' means 'A is daughter of B'
'...
‘R+S’ means ‘R is the daughter of S’. ‘R−S’ means ‘R is the husband of S’.‘R × S’ means ‘R is the brother of S’. If ‘T × V...
If ‘R @ S × T ÷ U × V’ is true then how is S related to V?
Relevant for Exams:
