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r-ruslan [8.4K]
3 years ago
11

Violet finds some nickels and pennies under the couch cushions. How much money (in dollars) does she have if she has 140 nickels

and 70 pennies? How much money (in dollars) does she have if she has xx nickels and yy pennies?
Total value, 140 nickels and 70 pennies (dollars):

Total value, xx nickels and yy pennies (dollars):
Mathematics
1 answer:
Fiesta28 [93]3 years ago
4 0

Answer:

$7.70

Step-by-step explanation:

140x5=700

70= well 70

700+70=770

770/100+7.7

7.7 in money is 7 dollars and 70 cents

:)

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What's the answer to this? and please explain.
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<h3>Answer: No, there isn't enough ribbon</h3>

===========================================================

Use this formula

a & b/c = (a*c+b)/c

to convert from a mixed number to an improper fraction

So,

a & b/c = (a*c+b)/c

3 & 3/4 = (3*4+3)/4

3 & 3/4 = 15/4

---------------------------------------------------

Next, we add the fractions 15/4 and 5/6. The denominators aren't the same, so we can't add right away. We need to get the denominators to the LCD.

In this case, the LCD is 4*6 = 24

  • The fraction 15/4 becomes 90/24 after multiplying top and bottom by 6.
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Now we can add the fractions:

90/24+20/24 = (90+20)/24 = 110/24

---------------------------------------------------

So far, we've added the 3&3/4 portion to the 5/6 portion to get the result 110/24

The last thing to do is to add on the two 1/3 ft pieces, which means we're adding on 2/3 of a foot

2/3 = 16/24 after multiplying top and bottom by 8

Add this to the result of the last section

110/24+16/24 = (110+16)/24 = 126/24

---------------------------------------------------

From here, we convert the improper fraction 126/24 to decimal form

Using a calculator, you should find that 126/24 = 5.25

The result is larger than 5, which means she used too much ribbon. There won't be enough ribbon to do everything she wants to do.

---------------------------------------------------

The shortcut we can take is to type the following into the calculator

3+3/4+5/6+2/3

doing so should lead to 5.25

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