What approximate value should come in place of the question mark (A in the following questions ? (Note : You are not expected to calculate the exact value.)
$$1.992 \times 24.998 \times 49.987 = ?$$
$$20.002 \times 39.996 \times 0.499 = ?$$
$$\sqrt{5623}=?$$
$$2001.14 \div 54.89 \times 9.899 = ?$$
$$3569 \div 19 = ?$$
What should come in place of the question mark (?) in the following number series?
17, 19, 23, 29, 37, ?
900, 899, 891, 864, 800, ?
4, 32, 224, 1344, 6720, ?
56, 54, 58, 50, 66, ?
655, 637, 622, 610, 601, ?