Question

Neha has ₹10 and ₹20 notes in her purse. if she has 15 notes in all which amounts to₹190, then how many notes of each type does she have?

Answer 1

Given :

Devshi has 590 Rupees

Total 25 notes

Rs50 & Rs20 ⇒ 3:5

Notes of Rs50 = 3x

Notes of Rs20 = 5x

Notes of Rs10 = 25 − (3x+5x) = 25 − 8x

Amount in 50 Rupee notes ⇒ 150x

Amount in 20 Rupee notes ⇒ 100x

Amount in 10 Rupee notes ⇒ 250 - 80x

⇒150x+100x+250−80x=590

⇒250−80x=590−250

⇒170x=340

∴ , x = 2

So Deveshi has

Notes of Rs.50 = 300

Notes of Rs.20 = 200

Notes of Rs.10 =  90

Answer 2

$\large \green{ \fcolorbox{gray}{black}{ ☑ \: \textbf{Verified \: answer}}}$

GIVEN

• Total notes = 15
• ₹10 + ₹20 = ₹190

SOLUTION

Lets number of notes of ₹10 be x ₹20 be y

• x + y = 15
• 10x + 20y = 190
• 10(15 - y) + 20y = 190
• 150 - 10y + 20y = 190
• 10y = 40
• y = 4
• x = 11

• Number of ₹10 notes = 11
• Number of ₹20 notes = 4