3 years ago

7 times a number is 84 , what is 4 times the number ? A ) 16 B) 28 C) 48 D) 56

Mathematics

2 answers:

vodka [1.7K]3 years ago

8 0

The answer is 48 as 84 divided by 7 is 12 times 4 is 48

liq [111]3 years ago

3 0

Answer:

C. 48

Step-by-step explanation:

first you solve 84 divided by 7 and your answer is 12 then you do 12x4 which is 48

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A coin bank has 250 coins, dimes and quarters, worth $39.25. How many of each type of coin are there?

Brilliant_brown [7]

$x-\ number\ of\ dimes\\y-\ number\ of\ quarters\\\\ \left \{ {{x+y=250\ \ \ | x=250-y} \atop {0.1x+0.25y=39.25\ \ \ \ \ \ \ \ \ \ \ \ \ }} \right. \\\\ substitution\ method\\\\
0.1(250-y)+0.25y=39.25\\\\
25-0.1y+0.25y=39.25\\\\
25+0.15y=39.25\ \ \ \ | subtract\ 25\\\\0.15y=14.25\ \ \ \ | divide\ by\ 0.15\\\\y=95\\\\x=250-95=
155\\\\
There\ are\ 155\ dimes\ and\ 95\ quarters.$