Question

Raju has 14 currency notes in his pocket consisting of only Rs. 20 notes and Rs.
10 notes. The total money values of the notes is Rs. 230. The number of Rs. 10
notes that Raju has is
(A) 5 (B) 6
(C) 9 (D) 10

Answer 1

You answer for this question will be C) 9

Sol:

Multiplying each of the given number with 10 then multiplying with 9 we get (9*10) = 90 then substract (230-90) = 140

I.e if we divide (140÷20) = 7

Hence the required number of Rs. 10 notes are 9.

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Answer 2

Answer:

(A) 5

Step-by-step explanation:

Let 'x' be the no. of 20/- notes and 'y' be the no. of 10/- notes.

Given that,

x + y = 14

y = 14 - x-------1️⃣

Total Value of notes = Rs. 230/-

ie;

20 x + 10 y = 230

20 x + [10 × (14 - x)] = 230

20 x + 140 - 10 x = 230

20 x - 10 x = 230 - 140

10 x = 90

x = 9

1️⃣---------- y = 14 - x

y = 14 - 9

y = 5

The number of Rs. 10/- notes that Raju has = 5