Question

Meena went to a bank to withdraw Rs 2000. She asked the cashier to
give her Rs 50 and Rs 100 notes only. Meena got 25 notes in all. Find how
many notes of Rs 50 and Rs 100 she received.

Answer 1

Answer:

15 notes of 100=1500

10 notes of 50=500

total notes 10+15=25

Answer 2

$\huge\sf{Answer}$

• first number be = x

• second number be = y

A.T.Q

⟹ 2(x) + 3(y) = 61

⟹ 2x + 3y = 61 ...(1)

Now,

⟹ 4(x) - 5(y) = 45

⟹ 4x - 5y = 45 ...(2)

Multiply equation 1 with equation 2

→ 2x + 3y = 61 (×2)

→ 4x + 6y = 122

→ 4x = 122 - 6y ...(3)

Substitute value of 4x in (equation 2)

⟹ 122 - 6y - 5y = 45

⟹ - 11y = 122 - 45

⟹ - 11y = - 77

⟹ y = 7

Substitute value of y in (equation 1)

⟹ 2x + 3(7) = 61

⟹ 2x + 21 = 61

⟹ 2x = 61 - 21

⟹ 2x = 40

⟹ x = 20

∴  First number = x = 20 

 Second number = y = 7

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