Solve the equation. n – 40 – 26 = –35

Mathematics

2 answers:

viva [34]3 years ago

8 0

Answer:

Step-by-step explanation:

n - 66 = -35

n = 31

Marat540 [252]3 years ago

5 0

Answer:

Step-by-step explanation:

n-40-26= -35

n= -35+26+40

n= 31

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How many grams of an alloy containing 25% silver should be melted with 50 grams of an alloy containing 60% silver in order to ob

Kipish [7]

Answer:

20 grams of an alloy containing 25% silver has to be melted with 50 grams of an alloy containing 60% silver to obtain a final alloy containing 50% silver

Step-by-step explanation:

We define

$A_{a}=50g @ 60\%$ , wich means alloy a has 50 grams containing 60% silver.

$A_{b}=xg @ 25\%$ , wich means alloy b has x grams containing 25% silver.

So we can build an equiation $50 \times 0.60+x \times 0.25=\frac{1}{2}(50+x)$ , as half of the final alloy has to be silver. Then solving for x

$30+0.25x=25+0.5x\\30-25=0.5x-0.25x\\5=0.25x\\x=\frac{5}{0.25}=20$

Wich means 20 grams of an alloy containing 25% silver ( $A_{b}$ ) has to be melted with 50 grams of an alloy containing 60% silver ( $A_{a}$ ) to obtain a final alloy containing 50% silver.