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need some explanation for Geometry.?
Jan has 21 coins. All of the coins are either pennies or dimes. The coins total $.84 in all. Let p = the number of pennies and d = the number of dimes. Which of the following pairs of equations should Jan use to determine how many coins there are of each value?
A.p + d = 21 and p + 10d = 84
B.p + d = 21 and 10(p + d) = 84
C.p + d = 21 and 10p = d
D.p + d = 21 and 10d = p
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