Math, asked by abdul7681, 4 months ago

if 2y+5x/3y-5x=2 1/2,find;
(1)x:y
(2)x,if y=70

Answers

Answered by aryansinghania5hdpsm
1

Answer:105

Step-by-step explanation:) (2y + 5x)/(3y – 5x) = (2 × 2 + 1)/2

(2y + 5x )/(3y – 5x) = 5/2

⇒ 2(2y + 5x) = 5 × (3y – 5x)

⇒ 4y + 10x = 15y – 25x

⇒ 35x = 11y

⇒ x/y = 11/35  i.e. x : y = 11 :  35

(ii) (2y + 5x)/(3y – 5x) = 5/2

Given y = 70

(2 × 70 + 5x)/(3 × 70 – 5x) = 5/2 ⇒ (140 + 5x)/(210 – 5x) = 5/2

⇒ 2 × (140 + 5x) = 5 × (210 – 5x)

⇒ 280 + 10x = 1050 – 25x

⇒ 35x = 1050 – 280

⇒ 35x = 770 ⇒ x = 770/35 = 22

(iii) (2y + 5x)/(3y – 5x) = 5/2

Given x = 33

(2y + 5 × 33)/(3y – 5 × 33) = 5/2 ⇒ (2y + 165)/(3y – 165) = 5/2

⇒ 2 × (2y + 165) = 5 × (3y – 165)

⇒ 4y + 330 = 15y – 825

⇒ 11y = 1155

⇒ y = 1155/11 = 105

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