What will come in place of question mark (?) 362.721 + 431.027 - 118.079 = 521.211 + ?

If √(x-y)(y+2)=7, x and y being positive whole numbers, then the values of x and y respectively are:

What was the total sales revenue in 1996

40219+ 38924 =?+67713

22% of? + 166.64 = 340

1/4 of 3/5 of 6/5 of a number is 54 what is the number?

If 3x – 5y = 5 and x/x + y = 5/7, then what is the value of x – y ?

If √18x14xX=84 then x equals:

 (3² * 4² * 5) ÷ 36 = (?)²-80

If a + b + c = 13, a² + b² + c² = 69, then find ab + bc + ca.