Ben had twice as many nickels as dimes. Altogether, Ben had $4.20. How many nickels and how many dimes did Ben have?

let No of dimes = x

No of nickels =2x

0.1x + 0.05*2x = 4.20

x= 21

No of Dimes = 21

No of Nickels = 21 *2 =42

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