Which of the following interchanges in signs will make the given equation correct?

17- 15 x 5 = 250

Which of the mathematical signs should be interchanged in the given equation to make it mathematically correct?

31 ÷ 14 × 9 + 3 − 7 = 66

Which of the following interchanges in signs and numbers will make the given equation correct?

8 x 6 + 4 = 52

If ‘+’ means ‘divided by’ ‘-’ means ‘add’, ‘×’ means ‘minus’ and ‘/’ means ‘multiplied by’, what will be the value of the following expression?
[{(5 × 10) - (16/4)} + (15 - 9)]/0

If + means −, − means ×, × means ÷, and ÷ means +, what will be the value of the following expression?
 3 ÷ 6 + 3 – 4 × 4 = ?

By interchanging the given two signs and numbers which of the following equation will be not correct?
 ÷ and ×, 1 and 3

By interchanging the given two signs and numbers which of the following equation will be correct?
 + and –, 7 and 6

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
 25 *5 * 10 * 2 * 4 * 10