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.

Question

Mathematics

Tobie

13 September, 00:33

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.

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Answers (1)

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Batman · Answer 1

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