How to fit 16 coins inside the puzzle tray? #shorts

A ball of radius 1 cm is put into a cylindrical pipe so that it fits inside the pipe. If the length of the pipe is 14 m, what is the surface area of the pipe?

The translocation of substances inside a cell and over short distances in the symplast is due to the process of

Sumitra has 34 in 50-paise and 25-paise coins. If the number of 25-paise coins is twice the number of 50 paise coins, how many coins of each kind does she have?

Vinay has some 50 paise coins , some Rs. 2 coins, some Rs. 1 coins and some Rs. 5 coins .The value of all the coins is Rs. 50 .Number of Rs. 2 coins is 5 more than the Rs. 5 coins .50 paisa coins are double in numbers than the Rs. 1 coins and the number of Rs. 1 coins is 13 . How many Rs. 2 coins does he have ?