The numbes x, y, z are proportional to 2, 3, 5. The sum ,of x, y, z is 100. If y ;= px - 10, then p is equal to

(1) 3/2

(2) 2

(3) 5/2

(4) 3

If three-fifth of a number is 420, what will be half of that number?

(1) 210

(2) 504

(3) 252

(4) 350

If  S.I. on a sum for 12 years is 950. Find the S.I. after 12 years, if the sum becomes double in 6 years.

(I) Rs. 1425

(2) Rs. 1275

(3) Rs. 1480

(4) Rs. 1050

The H.C.F of the expressions x² - 3x² - 4 and x² - 4x² + x  is

(1) x-1

(2) x+1

(3) x²-1

(4) x² -3