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प्रश्न
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?
योग
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उत्तर
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
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