Which of the following interchange of numbers and mathematical signs would make the given equation correct?
72 ÷ 6 − 20 + 30 × 5 = 70

If $ means +, @ means ×, # means -, and * means ÷, then what is the value of :

5 @ 20 * 4 $ 6 # 30 = ?

If '+' means '-', '-' means '×', '×' means '÷' and '÷ means '+', then what will come in place of the question mark (?) in the following equation?
98 × 14 + 6 ÷ 36 - 8 = ? ​​

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.

(87 * 63) * 6 * 1 * 5​​