A bag has Rs. 51.25 in the form of 2-rupee, 50-paise and 25-paise coins in the ratio of 3 : 5 : 7. What is the total number of 50-paise coins?
A. 15
B. 35
C. 25
D. 5
Answer: Option C
Solution(By Examveda Team)
\[\begin{array}{*{20}{c}} {}&{{\text{Rs}}{\text{. 2}}}&{}&{{\text{50 Paise }}}&{}&{{\text{25 Paise}}} \\ {{\text{Coins}}}&3&:&5&:&7 \end{array}\]Amount = Number of coins × Face value
Amount = $$6:\frac{5}{2}:\frac{7}{4}$$
According to question,
$$\eqalign{ & \Rightarrow 6x + \frac{{5x}}{2} + \frac{{7x}}{4} = 51.25 \cr & \Rightarrow 24x + 10x + 7x = 51.25 \times 4 \cr & \Rightarrow 41x = 205 \cr & \Rightarrow x = \frac{{205}}{{41}} \cr & \boxed{x = 5} \cr} $$
∴ Total number of 50 paise coins = 5 × 5 = 25
Related Questions on Ratio
If a : b : c = 3 : 4 : 7, then the ratio (a + b + c) : c is equal to
A. 2 : 1
B. 14 : 3
C. 7 : 2
D. 1 : 2
If $$\frac{2}{3}$$ of A=75% of B = 0.6 of C, then A : B : C is
A. 2 : 3 : 3
B. 3 : 4 : 5
C. 4 : 5 : 6
D. 9 : 8 : 10
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