Which two numbers should be interchanged to make the following equation correct?
7 – 8 ÷ 4 + 5 × 3 = 8 × 3 + 6 ÷ 2 – 3

In the following question, by using which mathematical operators will the expression become correct?
30 ? 6 ? 4 ? 5 ? 4

If A, represent ‘ – ‘ and C, represent ‘ × ‘, D represent ‘÷’, and E represent ‘+’ then the value of
14 C 3 A 12 E 4 D 2=?

Which two signs should be interchanged to make two given equation correct.
4 × 8 ÷ 16 – 4 + 6 – 3 + 2 = 32

There were 15 persons in a group, they shook hands with each other, then tell how many times the total number of hands were shaken -

When Rahul was born, his father was 32 years older than his brother and his mother was 25 years older than his sister. If Rahul's brother is 6 years older than him and his mother is 3 years younger than his father, how old was Rahul's sister when he was born ?

The pages of a book had been numbered 1 to 100 manually. How many times will it be essential to write the digit 5? 

if 12 ( 20 ) 16 and 21 ( 35 ) 28, then what is value of A in 48 ( 80 ) A ?