Weeds which are of no use and does not have any economic value are known as

Which among the given operators should replace the “%” (in the same order) in the given expression below:

9 % 14 % 9 % 90 % 42 % 15

If ' + ' means ' × ', ' - ' means ' ÷ ', ' × ' means ' - ' and ' ÷ ' means ' + ' then 18 × 9 ÷ 3 + 8 - 4 = ?

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

8 – 32 + 20 × 15 ÷ 3 = 271

If "+" means "subtraction", "×" means "division", "÷" means "addition" and "–" means "multiplication", then solve 98 – 2 x 14 ÷ 5 – 7 + 40 .

If we interchange 2 and 1, then what will be the resultant of the given equation?

21+ 18 ÷ 6 × 12 – 7 = ?

If ‘÷’ means ‘-’, ‘-’ mean ‘+’, ‘+’ means ‘×’ and ‘×’ means ‘÷’, compute the value of the expression:

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

400 * 100 * 25 * 15 * 12 = 452