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

how do you solve (3*x) *7

Two factors of –48 have a difference of 19. The factor with a greater absolute value is positive.

what is immune disorder? what cause immune disorder

what part of the presidential election process are established by the constitution

which statement below considers how the environment affects health? A Ned is the most popular boy in school B Ned's mom is an addict,but he manages to atay in s

Time (weeks) Lake Depth (feet) 0 346.0 2 344.8 5 343.0 7 341.8 10 340.0 12 338.8 An environmental agency studying the effects of drought on a lake found th

the price of a gallon of unleaded gas was $2.79 yesterday. today, the price rose to $2.85 . find the percentage increase. round your answer to the nearest tenth

what is the radius of a circle in which a 30° arc is 2 inches long?

what is the mass of cement block that requires a force of 200 n to accelerate it at 5 m/s2?

Solve and graph then write the solution in interval notation. 2x<-4 and 3x>-27