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4 Marco has 20% fewer marbles than Willem. When Marco gave 80 marbles to Willem, the number of marbles
that he has left is half of what Willem currently has. How many marbles did Marco have at first?​


Sagot :

Answer:

Andy has 320 marbles while Henry has 400 marbles.

Explanation:

Although there are two people involved in this problem, we can solve it by using one variable.

Let the number of marbles that Henry has be

x

Andy has

80

%

x

and

Henry has

100

%

x

or, Andy has

0.8

x

marbles and Henry has

x

marbles

Andy now gives 80 marbles to Henry, so he has 80 fewer marbles and Andy has 80 more marbles.

Andy has

:

(

0.8

x

80

)

and Henry has

(x+80)

Andy now has half as many as Henry , which means that Henry has twice as many as Andy.