Question

3900 bulbs were used to decorate a building, of these, 25% were green, 15% were red and

the rest were yellow. Find the number of yellow bulbs use


please answer this I am really confused :(​

Answer 1

Total bulbs = 3900

green bulbs = 3900 × 25% = 3900 × 25/100

= 39 × 25 = 975 bulb

red bulbs = 3900 × 15% = 3900 × 15/100

= 39 × 15 = 585 bulb

green bulbs + red bulbs = 975 + 585 = 1560 bulbs

So, yellow bulbs = 3900 - 1560

Ans = 2340 bulbs are yellow

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