hayleegahr
16.07.2019 •
Mathematics
Ajeweler has 5 rings, each weighing 18 g, made of an alloy of 10% silver and 90% gold. she decides to melt down the rings and add enough silver to reduce the gold content to 75%. how much silver should she add?
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Ответ:
Gold = 90%
Amount of gold to be deducted
90/100 × 18 = 16.2 g
75/100 × 18 = 13.5
16.2 - 13.5 = 2.7
Amount o silver to added.
2.7 × 5 = 13.5
Answer = 13.5 g
Ответ:
Step-by-step explanation:
we can solve this question by using transposition method:
W=12/4
W=3 Answer
hope it helps