A man can go on a motor boat with a speed of 25 km/hour

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

364 * 4 * 7 * 4 * 12 = 75

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

15 ÷ 6 - 10 x 5 + 11 = 99

If 236 = 33, 487 = 57, 6391 = 57, then 851 = ?

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

38 ÷ 26 – 2 + 5 × 4 = 45

Select the correct combination of mathematical signs that can sequentially replace '*' sign and balance the equation given below.

12* 6 * 3 * 54 * 9 * 12

If “+” means “minus”, “×” means “divided by”, “÷” means “plus”, and “-“ means then “multiplied by”