Question
A piggy bank holds 20-paise, 50-paise and 2-rupee coins in
the ratio 15:12:9. The total amount inside is Rs. 3006. How many 50-paise coins are there?Solution
ATQ,
Let number of coins = 15x, 12x, 9x
Amount = (15x × 0.20) + (12x × 0.50) + (9x × 2)
⇒ 3x + 6x + 18x = 3006
⇒ 27x = 3006
⇒ x = 111
So, number of 50-paise coins = 12x = 12 × 111 = 1332
A sequence {Sₙ} is defined by:
Condition I: S₁ = 3 and for all n ≥ 2, Sₙ = 2·Sₙ₋₁ + (−1)ⁿ.
Condition II: The second ter...
27 44 63 86 ? 146
6 16 116 566 2272 6814
11 a�...
100, 110, ?, 171.6, 240.24, 360.36
31 16.5 18 �...
104 136 152 160 164 ?
...30 32 67 206 ? 4166
625, 5, 125, 25, 25, ? , 5
16 4 2 1.5 1 1.875
...130 155 146 195 186 ?
...
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