Which of the following numbers will replace the question mark (?) in the given series? निम्नलिखित में से कौन सी संख्या दी गई श्रृंखला में प्रश्न चिह्न (?) का स्थान लेगी? 20, 25, 25, 35, 30, 45, ?, 55, 40

Which of the following numbers will replace – 20, 25, 25, 35, 30, 45, ?, 55, 40

Split the series into two parts:
Odd positions: 20, 25, 30, 35, 40 =(+5)
Even positions: 25, 35, 45, 55 = (+10)
So, the missing number is: 35