`16xx12-672-:21=?-211`

What will come in place of question mark(?) in the following questions? 16x12 -672+21 = ? -211

21-12-:3xx2

7/8 of 616 xx 12 -: 16+?=17xx19+81+4/3xx?

12^16xx12^-4 =

Correct the following equations by interchanging the two signs. 16+4-:2-21xx7=21

If 2xx16=8,8xx8=1,6xx12=2 , then 12xx144=?

12/2-6xx3+8=16

No of prime factors in 25^(16)xx5^(17)xx12^(18)

Simplify: (a) (789xx789-789xx211+211xx211)/(789xx789-789xx211+211xx211) (b) (658xx658xx658-328xx328xx328)/(658xx658+658xx328+328+328)

Simplify the given expression 21 xx (23-12) - ((-1xx10) + 21)