After interchanging the given two signs, what will be the value of the following expression?

× And ÷

20 + 5 ÷ 6 × 2 – 5

What is the value of y in the following equation?
(1÷23) of [2{3 + 4(35 + 7)}] = y

If $${b\over a}=0.7$$ find the value of $${a-b\over a+b}={11\over34}.$$

What should come in place of the question mark (?) in the following mathematical statement?
$${{?^6÷16=108}}$$

? – 2³ =(7² – 12 ) + ( 10² -17)

If x = 222, y = 223 and z = 224, then find the value of x³+y³+z³-3xyz

then find