निम्नलिखित में से

2.5          1.25        1.25        1.875      3.75        ?

1, 7, 25, 61, ?

23, 39, 64, 100, ?, 213

38% of 18/225 of 31/19 of 15225 =?

47, 72, 122, ?, 297, 422

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

160, 223, 271, 306, 330, ?

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

100, 81, 64, 51, 40, ?

81 72 136 111 ? 278

10, ?,  50, 100, 250, 500

Which of the following numbers will replace the question mark (?) in the given series?

17, 30, 44, 59, 75, ?