Which institution collaborated with the Bureau of

If '+' means '÷', '÷' means '–', '–' means '×', '×' means '+', then ' 30 + 10 ÷ 6 – 5 × 6 ' = (?)

Which signs should be interchanged to make the given equation correct.

45 ÷ 5/3 + 10 × 2/5 - 5 = 95

After interchanging '- ' and '+ ' , 6 and 7 , which of the following equations becomes correct?

Select the correct combination of mathematical signs to sequentially replace the signs, to balance the following equation.

(12*7*6)* 13 *6

A cube is made by following the given sheet. In the cube so formed, What would be the symbol on the opposite side of the # Symbol?

If 'P' denote '÷', 'θ' denotes 'x', 'R' denotes '+' and 'S' denotes '-', what is the value of ' 18 θ 12 P 4 R 5 S 6 '.

If ‘#’ denotes ‘-‘, @ denotes ‘×’, ‘$’ denotes ‘+’ and ‘%’ denotes ‘÷’, then 

20 $ 15 # 10 @ 45 % 15

The given equation has been solved on the basis of a certain rule. Find the correct answer for the unsolved equation on that basis.

Which two signs should be interchanged to make the given equation correct?

225 + 5 × 3 ÷ 5 – 7 = 133