Question

A machine is used for making rubber balls and makes 500 balls in 30 minutes. How many balls will it make in 3 1/2 hours?

Answer 1

30 minutes = `30/60 = 1/2` hours

In `1/2` hours ball makes by machine = 500

In 1 hours balls makes by machine = `500 xx 2/1` = 1000 balls

∴ In `3 1/2 (7/2)` hours, balls are make by machine

= 500 × 2 × `7/2` = 3500 balls