The barrel of an ink pen cylinders in shape is 7cm long and 5mm in diameter.A child filled up the ink in this pen from 1 line ink bottle. How may times a child will filled his ink pen.

Answer 1

not sure what "1 line" is in volume. Anyway, when you figure out how many ml the bottle holds, divide it by the pen's volume, which is

(3.14) (3.5)^2 (0.5) cm^3 (or ml)

Answer 2

Rats - mixed up the dimensions. Use

(3.14) (.5)^2 (7)