997.97, 25.63, 7.18, ?
In this series each number has 2 parts, number part and fraction part.
number part in the next number is sum of the digits in the previous number's number part.
fraction part in the next number is multiplication of digits in the previous numbers fraction part.
999.97 => 9+9+7 = the number part in next number i.e 25
999.97 => 9*7 = fractional part in the next number i.e 63.
so in missing number is 7 is the number part and 1*8 is the fractional part. = 7.8
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