Question

5. In a series of 570 red and green bulbs, 30% are green bulbs. How many red bulbs are there in the series?​

Answer 1

Answer :-

• The number of red bulbs in a series are 399 bulbs.

Step-by-step explanation ::

To Find :-

• Number of read bulbs in the series

Solution :-

Method 1 :-

Given that,

• Total number of bulbs = 570
• Percentage of green bulbs = 30%

Therefore, number of green bulbs are,

=> 30/100 × 570

=> 0.3 × 570

=> 171

The total number of green bulbs in the series is 171 bulbs.

According the question,

Number of red bulbs are :-

Number of red bulbs = Total number of bulbs - Green bulbs,

=> Red bulbs = 570 - 171

=> Red bulbs = 399

Hence, number of red bulbs in a series are 399 bulbs.

Method 2 :-

Given that,

• Total number of bulbs = 570
• Percentage of green bulbs = 30%

Therefore, percentage of red bulbs in series are :-

=> ( 100 - 30 )%

=> 70%

According the question,

Number of red bulbs are,

=> 70/100 × 570

=> 0.7 × 570

=> 399

Hence, number of red bulbs in a series are 399 bulbs.