If ' + ' mean ' - ' , ' - ' means ' x ', ' x ' means ' ÷ ' and ' ÷ ' means ' + ' , then the value of 16 x 2 ÷ 25 + 7 - 4 is.

16 x 2 ÷ 25 + 7 - 4
After replacing the sign according to the given question
16 ÷ 2 + 25 - 7 x 4
Apply the rule BODMAS
B - Brackets first
O - Orders (i.e. Powers and Square Roots, etc.)
DM - Division and Multiplication (left-to-right)
AS - Addition and Subtraction (left-to-right)
             = 16 ÷ 2 + 25 - 7 x 4
             = 8 + 25 - 28
             = 25 - 20
             = 5