How many combinations of pennies (1 cent), nickels (5 cents) and/or dimes (10 cents) are there with a total value of 25 cents?

Hello ,
there are 12 combinations

 num           x             y             z
 1             0             1             2
 2             0             3             1
 3             0             5             0
 4             5             0             2
 5             5             2             1
 6             5             4             0
 7             10            1             1
 8             10            3             0
 9             15            0             1
 10            15            2             0
 11            20            1             0
 12            25            0             0

 

DIM x AS INTEGER, y AS INTEGER, z AS INTEGER, k AS INTEGER
'OPEN "c:\nosdevoirs\monnaie.sol" FOR OUTPUT AS #1
k = 0
FOR x = 0 TO 25
    FOR y = 0 TO 5
        FOR z = 0 TO 3
            IF x + 5 * y + 10 * z = 25 THEN
                k = k + 1
                PRINT k, x, y, z
'                PRINT #1, k, x, y, z

            END IF
        NEXT z
    NEXT y
NEXT x
'CLOSE #1
END

Ithink your answer could be b