Respuesta :

twenty pounds and 69 p
j20182
{unknown number}
shoe→$X 
sock→$Y

7X+2Y=39------------1
5X+2Y=29------------2

minus the first and the second,then 2Y would disappear
7X-5X=2X , 39-29=10
then you will have 2X=10 ,so X=5
take X=5 in each of the formula , then get Y=2

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