# QA – Placement Quizzes | Algebra | Question 14

A total of 324 coins of 20 paise and 25 paise make a sum of Rs 71. The number of 25-paise coins is:**(A)** 104**(B)** 120**(C)** 128**(D)** 124**Answer:** **(D)****Explanation:** Let the number of 20-paise coins be x and the number of 25-paise coins be y. Then,

x + y = 324 (equation 1)

And,

x/5 + y/4 = 71

4x + 5y = 71*20 (Multiplying by 20 on both sides)

Substituting the value of x from equation 1, we get

4(324-y) + 5y = 71*20

1296 – 4y + 5y = 1420

y = 124.

Quiz of this Question

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