tuutseyoo tuutseyoo

23-01-2018
Mathematics

contestada

a collection of dimes and quarters total cost $3.55. There are 25 coins in all. how many quarters are there?

Respuesta :

texaschic101 texaschic101

23-01-2018

d + q = 25.....d = 25 - q
0.10d + 0.25q = 3.55

0.10(25 - q) + 0.25q = 3.55
2.50 - 0.10q + 0.25q = 3.55
-0.10q + 0.25q = 3.55 - 2.50
0.15q = 1.05
q = 1.05 / 0.15
q = 7 <=== there are 7 quarters

d + q = 25
d + 7 = 25
d = 25 - 7
d = 18.....and 18 dimes

Answer Link

Otras preguntas

Within a few weeks Snowball's plans for the windmill were fully worked out. The mechanical details came mostly from three books which had belonged to Mr. Jones—

C’est une personne qui enseigne et donne le savoir aux étudiants. A. traducteur B. écrivain C. ministre D. professeur

If y=-3x+ 10, give the ordered pair (x,y) for which the y-value is twice the x-value. PLEASE HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP

instead of learning command words,a gui user can choose from a

- Find the surface area of a square pyramid with side length 1 in and slant height 2 in.

Someone helppp please??

??????????????????????????????????????????????????

Is the answer for this question is 35?

The number of gallons of gas that were in the tank minus 9 leaves 3 gallons

What did Van Gogh think an artist should be like? Kind Calm Wealthy Poor