Aperson has 20 coins, all nickels and dimes, worth one dollar and 40 cents. how many nickels are there? if n = number of nickels and d = number of dimes, which system of equations represents the problem? n + d = 20 and n + d = 1.40n + d = 20 and 5n + 10d = 1.40n + d = 20 and 5n + 10d = 140

The correct answer to this question would be:

n+d=20 and 5n+10d=140

Step-by-step explanation:

answerim :

n

step-by-step explanation:

im not sure but my dad knows

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