On which rate ₹ 500 will become ₹ 605 in 3 years?

C) (x + 5) years

Correct option is  B) 15 years

Correct option is (D) none Let Ramu's present age be x years. \(\therefore\) Ramu's age before 4 years = (x - 4) years Ramu's age after 12 years = (x + 12) years \(\therefore\) x+12 = 3(x-4) \(\Rightarrow\) x+12...

Correct option is  B) ₹ 50

Correct option is (A) 7% P = 500, T = 3 years. Let rate of interest be R Amount after 3 years = P + S.I. = P + \(\frac{PRT}{100}\) \(=500+\frac{500\times R\times3}{100}\) = 500 + 15R Given...

Correct option is (A) ₹ 3375 Let the amount be Rs x. R = 12% T = 3 years Amount after 3 years = Rs 4590 \(\therefore\) \(x+\frac{x\times12\times3}{100}\) = 4590   (Amount after 3 years \(=P+\frac{PRT}{100})\) \(\Rightarrow\) \(x+\frac{9x}{25}\) = 4590 \(\Rightarrow\) \(\frac{34x}{25}\) = 4590 \(\Rightarrow\) \(x=\frac{4590\times25}{34}\) = 3375

Let the present age of Shikha be ‘a’ years.  Given, product of Shikha’s age five years ago and her age 8 years later is 30  ⇒ (a – 5)(a + 8) =...