How many 7's are there in the following number series which are preceded by an even number but not followed by any odd number? 437523721367542742712276572

If bc + cd = 2bd and a + c = 2b, then which one of the following is correct?

Father is aged 3 times more than his son after 8 years, he would be two and half times of his son's age. after further 7 years, how many times would he be of his son's age?

A man fills a basket with eggs in such a way that the number of eggs added on each successive day is the same as the number already present in the basket. This way the basket gets completely filled i…

If (3a +6b +c +2d) x (3a - 6b - c +2d) = (3a - 6b +c- 2d) x (3a +6b - c- 2d), then which one of the following is correct ?

One fourth of the sum of the odd numbers greater than 14 but less than 50 is the square of -