Question
"A piggy bank comprises 5-rupee coins, 10-rupee coins,
and 20-rupee coins. The quantity of 5-rupee coins in the piggy bank is 75% more than the number of 20-rupee coins and 30% less than the number of 10-rupee coins. If two coins are randomly drawn from the piggy bank, the probability of drawing a 5-rupee coin and a 10-rupee coin is 1/3. Determine the total number of coins in the piggy bank."Solution
ATQ, Let the number of 10 rupees coins in the piggy bank be 'p'. So, the number of 5 rupeees coins in the piggy bank = 0.7p And the number of 20 rupees coins in the piggy bank = 0.70/1.75 = 0.4p So, the total number of coins in the piggy bank = p + 0.7p + 0.4p = 2.1p So, the probability that a 5 rupees coins and a 10 rupees coins are drawn = pC1 × 0.7pC1/ 2.1pC2 = 1/3 (2p × 0.7p) / {2.1p (2.1p - 1) } = 1/3 2.1p - 1 = 2p 0.1p = 1, p = 10 So, the total number of coins in the piggy bank = 2.1 × 10 = 21
Which two numbers and two signs should be interchanged in the following equation to make it correct?
22 - 8 + 12 x 6 + 20 = 104
Statements: F ≥ G < E, G > D ≥ C = N
Conclusions: Â Â Â Â
 I. E > N
II. F > D
What was the day of the week on 24 August 1923?
Seven persons G, H, I, J, K, L, and M have different heights. H is taller than J. H is taller than G, who is just shorter than J. L is shorter than M. O...
If 6 $ 4 $ 7 = 101 and 2 $ 5 $ 11 = 150, then what is the value of T in T $ 8 $ 9 = 289?
Statement:
Some P are Q
Some R are S
No Q is R
Conclusion:
I. Some S are P
II. No P is S
...Select the correct mirror image of the given figure when the mirror is placed to the right side of the f igure at ‘XY ’.
In a certain code, VANILLA is written as XXPFNIC. How is CARPENTER written in that code?
____ is the mother of E.
