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

#24 please a-c with cindys age

What ordered pair describes the location of point P?

A relationship __________. a. consists of a connection between individuals or groups that rarely causes personal stress b. consists of a connection between indi

How is stress related to perception

When is the BEST time to be treated for an STI? a. Only after the symptoms of the STI begin to subside should a person seek treatment. b. When a person st21 tre

Animals have more mechanisms for asexual reproduction than plants. a. True b. False

jessica has two sticks. the sticks are the same distance apart at every point. how would you best describe the sticks

The Populist Party of the 1890's was an example of a party formed chiefly to help a__________ . a. candidate register in a national election b. land aria achiev

what are fused in the production of monoclonal antibodies? A. Tumour cells and T-cells B. Tumour cells and B-cells C. B-cells and T-cells D. Antibodies and ant

A high protective tariff passed by congress is intended to affect the united states economy by