What value should come in the place of question mark (?) in the following questions ?
$$\frac{3}{7}of\frac{497}{249}of?=639$$
Expression : $$\frac{3}{7}of\frac{497}{249}of?=639$$
=> $$\frac{71}{83} \times ? = 639$$
=> $$? = \frac{639 \times 83}{71}$$
=> $$? = 9 \times 83 = 747$$
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