Which company launched the world’s first rocket with a

If ‘P’ means (÷), ‘Q’ means (×), ‘R’ means (+), and ‘S’ means (-), then what is the value of the expression:

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

9 × 10 ÷ 2 – 4 = 51 + 2 

If '+' means '-', '×' means '+', '-' means '÷', and '÷' means '×', then what is the value of the expression ' 100 - 10 + 30 × 5 ÷ 2 × 10' ?

A toy is sold for Rs. 800 at 60% profit when profit is calculated on selling price. Find the profit% on cost price?

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

What will come in place of ‘?’ in the given expression?

13 × 11 + 12² + 27 × (2/3) = ?

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

60 * 48 * 36 * 6 * 15 * 53

If '#' means ' - ', '@' means '+', '$' means '÷' and '&' means ' X ', then what is the value of the following expression?

72 # 91 $ 7 & 4 @ 18