Answered

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270 american dollar and recevied 3000 pesos when he returned from mexico he had 100 pesos left. how many will he recevie when he exchanges these pesos for dollars

Sagot :

To solve this problem we can use simple proportion
If 
270$ -------------------------3000 pesos
x $  ---------------------------100 pesos               (x$ means that we dont know how much)
Now we crossmultiplying to get proportion
x*3000=270*100
Now we just to solve eq
3000x=27000  /:3000
x=27000:3000
x=9$ - its the result
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