Question

Meera has $600 in the form of notes of $10 and $20 denomination.Number of $10 notes in three times the number of $20 notes.Find the number of notes of each denomination​

Answer 1

Answer:

12 notes of 20$ is there

Step-by-step explanation:

let us consider that there is X notes of 20 $

Now we know that no of 10 RS notes is 3 times to the 20$ notes so no of 10 $ note is 3x

Now:- 10(3x)+ 20(x)= 600

=> 30x+20x = 600

=> 50x = 600

=> x = 600/50 = 60/5 = 12

Proof :- 12×20 = 240 RS

also 10 $ notes is three time to the 20$ note

so

12×3×10

=> 360

240+360 = 600✓✓

Answer 2

Answer:

$20 notes = 12

$10 notes = 36

Step-by-step explanation:

Let,

$20 notes = x

$10 notes = 3x

Total amount = $600

★ Value of total notes:

20x

10 × 3 = 30x

According to question :

⇒ 20x + 30x = 600

⇒ 50x = 600

⇒ x = 600 / 50

⇒ x = 12

.°. $20 notes = 12

★ Value of 3x:

⇒ 3 (12)

⇒ 3 × 12

⇒ 36

Therefore,

$20 notes = 12

$10 notes = 36

★ Verification :

Total amount:

⇒ $20 notes × 12 = $240

⇒ $10 notes × 36 = $360

⇒ $240 + $360 = $600

Total amount = $600