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A sewing bag contains 3 gold buttons and 4 black buttons. How many buttons need to be added to the sewing bag so that there are 30% gold buttons?

Respuesta :

beefcake88
You need to add 3 more black buttons so that there is a total of 10 buttons. This will mean that there’s is 30% gold buttons
amna04352

Answer:

3 black

Step-by-step explanation:

Currently: 7 buttons

30% gold so 70% should be black

70% = 0.7

(4+x)/(7+x) = 0.7

3+x = 0.7(7+x)

4+x = 4.9 + 0.7x

0.3x = 0.9

x = 3

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