`20+30xx0+1=?`

0.02xx30 = ?

If "-" and " xx " signs as well as "7" and "3" are interchanged, then which of the one following is correct ? A. 20 xx 1 - 7 = 3 B. 1 xx 20 - 7 = 20 C. 3-7 xx 1 = 20 D. 20 - 3 xx 1 = 7

10 xx 20 xx 30 xx 40 xx ------------- xx 1000

Find the no. of zeros in expression : 10 xx 20 xx 30 xx ……xx 1000 .

3 xx 0.3 xx 0.03 xx 0.003 xx 30 = ?

Say True or False: (-100) xx 0 xx 20 = 0