If ' + ' means '–', '–' means 'x', 'x' means ',÷ ' '÷' means '+', what will come in place of the question mark (?) in the following equation?
15 - 2 $$\div$$​ 90$$\times$$​ 9 + 10 = ?

If ‘+’ means ‘subtraction’, ‘−’ means ‘multiplication’, ‘×’ means ‘division’ and ‘÷’ means ‘addition’, then what will come in place of the question mark (?) in the following equation?
64 × 8 + 6 − 6 ÷ 33 = ?

If + means −, − means ×, × means ÷ and ÷ means +, then what will come in place of the question mark (?) in the following equation?
75 × 5 + 11 − 2 ÷ 18 = ?

If ‘A’ stands for ‘÷’, ‘B’ stands for ‘×’, ‘C’ stands for ‘+’ and ‘D’ stands for ‘−’, then what will come in place of the question mark (?) in the following equation?
9 B 5 D 12 A 2 C 11 = ?

If 'A' stands for '÷', 'B' stands for '×', 'C' stands for '+' and 'D' stands for '–', then what will come in place of the question mark (?) in the following equation?
100 A 5 C 14 D 5 B 3 = ?

What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘÷’ are interchanged and ‘−’ and ‘×’ are interchanged?
15 − 3 ÷ 21 + 3 × 36 = ?

What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘÷’ are interchanged and ‘−’ and ‘×’ are interchanged?
26 + 2 × 12 − 2 ÷ 16 = ?

If + means -, - means ×, × means ÷ and ÷ means +, then what will come in place of the question mark (?) in the following equation?
64 + 18 × 6 ÷ 5 - 3 = ?

If + means −, − means ×, × means ÷, and ÷ means +, what will come in place of the question mark (?) in the following equation?

20 – 4 ÷ 7 + 12 × 4 = ?​