Direction: In the following questions 3 series are given. You have to find the value of a, b and c by identifying the pattern of the series and then you have to establish the relation among a, b and c?

I.  601, 721, 751, a, 766

II. 753, 769, b, 765, 763, 764

III. 23, 24, 50, 153, c, 3085

A father's age was 8 times his son's age 4 years ago. Presently the father's age is 4 times that of his son. Find the present age of the son?

Select the correct combination of mathematical signs to replace * signs and to balance the following equation.

(18 * 9 * 14) * 37 * 4

If "P" denotes "multiplied by", "R" denotes "subtracted from", "S" denotes "added to" and "Q" denotes "divided by", then which of the following equation is true?

If “+” denotes ‘ – ‘ , ‘ – ‘ denotes ‘× ‘, ‘×’ denotes ‘÷’  and ‘÷’ denotes ‘+’, then what is the value of
15 – 5 +15 ÷ 45 × 15

If the ratio of two numbers is 13 : 15 and their L.C.M. is 39780. So are the numbers?

Ram was twelve times as old as his son twenty years ago. Now he is twice as old as his son. What are the present ages of the son and Ram?

Which two signs should be interchanged to make the following equation correct?
5 + 3 x 8 - 12 ÷ 4 = 3