What value should come in place of the question mark (?) in the following question?

52x14+145018=1998÷?

What value should come in place of the question mark (?) in the following question?

325-122+75=?2-68

Direction: What value should come in place of the question mark (?) in the following question?

529*6/2*?=14076

What value should come in place of the question mark (?) in the following question?

1637 + 1832 = 452 + (?)2

What value should come in place of the question mark (?) in the following question?

264÷576+112+12 = ?2

What will come in place of question mark (?) in the following question?

34 of 35 of 23 of ? = 3174

If X and Y are the two digits of the number 347XY such that the number is completely divisible by 80, then what is the value of X + Y?

A, B and C can complete a work in 20, 24 and 30 days respectively. All three of them starts together but after 4 days A leaves the job and B left the job 6days before the work was completed. C completed the remaining work alone. In how many days was the total work completed?

A solid sphere of diameter 17.5 cm is cut into two equal halves. What will be the increase (in cm2) in the total surface area?