If the difference between four times and eight times of a number is 36, then the number is;
Find the odd one out in the series:
4, 9, 25, 36, 121, 169
+ means ×; × means ÷; ÷ means –; then 8 +3 × 2 ÷6 = ...........
If 5 × 4 = 10, 7 × 6 = 21, 9 × 8 = 36 then 11 × 2 = ..........
Complete the series:
5,10,30, ...................
The cost price of 10 books is equal to the selling price of 9 books. Find the gain percent.