जर x + y = 12, y + z = 15 आणि x + z = 18, तर x + y + z = ? शोधा.

  1. 18
  2. 12
  3. 15
  4. 22.5

Answer (Detailed Solution Below)

Option 4 : 22.5
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
100 Qs. 100 Marks 90 Mins

Detailed Solution

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दिलेले आहे:

x + y = 12, y + z = 15, x + z = 18

गणना:

x + y = 12      ----(1)

y + z = 15      ----(2)

x + z = 18      ----(3)

(1) आणि (2) समीकरणे सोडवून

⇒ x – z = -3      ----(4)

(3) आणि (4) समीकरणे सोडवून

⇒ x = 7.5

x चे मूल्य समीकरण (1) मध्ये ठेवून

⇒ y = 4.5

y चे मूल्य समीकरण (2) मध्ये ठेवून

⇒ z = 10.5

x + y + z

⇒ 7.5 + 4.5 + 10.5

⇒ 22.5

x + y + z चे मूल्य 22.5 आहे.

Shortcut Trick

(1), (2) आणि (3) यांची बेरीज करा

⇒ 2(x + y + z) = 45     

⇒ (x + y + z) = 45/2 = 22.5

∴ x + y + z चे मूल्य 22.5 आहे.

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