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?

Question

Mathematics

Ashley Lloyd

4 December, 23:50

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?

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Answers (2)

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Aylin · Answer 1

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

Howell · Answer 2

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