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Answer:
30 each of 23% bars and 18 each of 79% bars
Step-by-step explanation:
If x is the number of 1 kg 23% copper bars, and y is the number of 1 kg 79% copper bars, then:
x + y = 48
0.23x + 0.79y = 0.44(48)
Substituting and solving:
0.23x + 0.79(48-x) = 0.44(48)
0.23x + 37.92 - 0.79x = 21.12
16.8 = 0.56x
x = 30
y = 48 - x
y = 18
You need 30 each of 23% bars and 18 each of 79% bars.
Answer:
1. =2
2. times 2
3. b.
Step-by-step explanation:
Answer:
6·(-5)
Step-by-step explanation:
-5= the change of gas per hour
6= total hours the bus has
If every hour the change of gas is -5 and theres a total of 6 hour then multiplication is involved. 6 hours would be positive not negative. This creating 6·(-5).
