Ka8kninniemartus2a Ka8kninniemartus2a

02-08-2016
Mathematics

contestada

mary and her brother john collect foreign coins. mary has 3 times the number of coins that john has. together they have 180 foreign coins. find how many coins mary has.

Respuesta :

apologiabiology apologiabiology

02-08-2016

total is 180
m+j=180

m has 3 times j
m=3j

sub 3j for m
3j+j=180
4j=180
divide both sides by 4
j=45
sub
m=3j
m=3(45)
m=135

mary has 135 coins

Answer Link

Otras preguntas

jake wants to enlarge his 12 foot by 14 foit garden. if he multiplies the dimensiond by 2, how will the area of the garden be affected?

Turn right at the next intersection, then go straight for about two kilometers. Go ______ the school and the supermarket, and then turn left. A: to B: through C

Why was the discovery of Tutankhamen’s tomb significant? -write at least 3 lines-

You want to convert 1 kilogram to milligrams. you already know that 1 kilogram = 1,000 grams. explain how knowing that 1 gram = 1,000 milligrams can help you

An insoluble solid formed during a reaction is called a ________________________.

Turn 0.46 into a fraction

Please help! I got −1.43844719 and −5.56155281 Use the quadratic formula to solve x2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth.

Which address uses correct punctuation? A. 23 Squirrel Street, Pittsburgh, Pennsylvania, 15201 B. 23 Squirrel Street, Pittsburgh Pennsylvania, 15201 C. 23 Squir

How did reconstruction affect daily life in South Carolina.

If the frequency of the waves produced by a vibrating object increases, how does the wavelength of the waves produced change? A) It stays the same B) It decrea