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Answer:
1/12
Step-by-step explanation:
The probability of just picking up a 1 is 1/4 since there is only one 1 out of 4 total cards.
If you eliminate that 1 card, there are 3 cards left, and the probability of then picking a 4 becomes 1/3.
Multiplying these probabilities, we get 1/4 * 1/3 = 1/12 as the probability of picking up a 1, not returning it, and then picking a 4 afterward.
D + q = 14....d = 14 - q
0.10d + 0.25q = 1.70
0.10(14 - q) + 0.25q = 1.70
1.40 - 0.10q + 0.25q = 1.70
-0.10q + 0.25q = 1.70 - 1.40
0.15q = 0.30
q = 0.30 / 0.15
q = 2 <=== 2 quarters
d + q = 14
d + 2 = 14
d = 14 - 2
d = 12 <=== 12 dimes