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

A cylinder has a radius of 14 m and a height of 6 m. What is the exact volume of the cylinder?

Why will marchers at the end of a long parade following a band be out of step with marchers nearer the band

Which sequence correctly shows how stars form? a nebula forms → nebula collapses → protostar forms → fusion begins b protostar forms → nebula forms → fusion beg

I am the measure of the amount of space a solid figure occupies. What am I?

What made this statement significant for many Americans?

All of the following are similarities between the US and state constitutions EXCEPT: A. They all have a Bill of Rights. B. They all list ways to amend the const

Which sentence does not contain any errors in the use of italics or quotation marks? A. Alec's family saw the movie "Fantasia" last weekend. B. This essay, How

The Whiskey Rebellion ?

what is brown has a hump and live in the North Pole

the area of a rectangle is 54 cm. the length is 2 cm more than a x and the width is 5 cm less than twice of x. solve for x. round to the nearest whole number