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

Josh the postmen has eleven red rubber bands. He gives Sunita three bands. Sunita now has twice the number of bands Josh has left. How many bands did Sunita hav

prove that Force is equal to mass and acceleration

what is eletro magnet

You spend $300 to start and costs $20 for each dog house # of dog houses 1 2. 3 4 5 6 7 Total cost to build

Students in a science class placed ice cubes in a cup. They were studying variables that affected how long it takes the ice to melt. Select the variable that wo

What is the value of |-25|?

find the x and y intercepts of 7/3x-1/3y=1

Which of the following is not an example for abiotic factor: a)rain b)salinity c)biodiversity d)humidity

Who tried to restore the Catholic Church to England after the death of Henry Vlll A)Phillip ll B)Mary l C)Elizabeth l D) his son, Edward Soo sorry here’s the

Making the strange seem more familiar is an overarching outcome of which method of conducting anthropology?