16. If 50% of (x - y) = 30% of (x + y), what per cent of x is y?

- Option : C
- Explanation : 50% of (x-y) = 30% of (x + y)

⇒ (50/100) (x - y) = (30/100) (x + y)

⇒ 5x - 5y = 3x + 3y ⇒ 2x = 8y ⇒ x = 4y

Required percentage = y/x × 1000%

= (y/4y) x 100% = 25%

17. If 35 is subtracted from a number reduces to its 80%. What is 4/5th of that number?

- Option : D
- Explanation : Let the number be x.

Then,x- 35= (80/100)x

x-(4/5)x = 35 ⇒ x/5 = 35 ⇒ x = 175

Now, 4/5 of x = 4/5 × 175 = 140

- Option : C
- Explanation : CP = 75000 Rs. Loss percentage = 15% . SP = (100 -15)% of 75000 . = 85/100 x 75000 = 63750 Rs

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