In a chocolate store, there are vanilla and chocolate flavor bon-bons only. 10% of the bon-bons are chocolate flavored, 90% of the rest are squashed. What percentage of the bon-bons is vanilla flavored that are not squashed?
Answer(s): C
Pick a number of bon-bons, like 100 for example.10 are chocolate, 90% of the rest (0.9 x 90 = 81) are squashed. That means that only 9 are vanilla and are not squashed.
A credit card number has 6 digits (between 1 to 9). The first two digits are 12 in that order, the third digit is bigger than 6, the forth one can be equally divided by 3 and the fifth digit is 3 times bigger than the sixth one. How many credit cards can be made?
Answer(s): B
First digit is 1, the second is 2, the third can be (7,8,9), the forth can be (0,3,6,9), the fifth and the sixth are dependent with one another. The fifth one is 3 times bigger than the sixth one, therefore there are only 3 options there: (1,3), (2,6), (3,9).All together there are: 1 x 1 x 3 x 4 x 3 = 36 options.
Out of a box that contains 4 black mice and 6 white ones, three are picked up. What is the probability that all three will be black mice?
The probability for the first one to be black is: 4/(4+6) = 2/5. The probability for the second one to be black is: 3/(3+6) = 1/3. The probability for the third one to be black is: 2/(2+6) = 1/4.The probability for all three events is (2/5) x (1/3) x (1/4) = 1/30.
A car is driving at 60 Km/h for 20 minutes, and then drives at 90Km/h for another 40 minutes. What is the average speed of the car?
Answer(s): A
The average speed is equal to: (Total distance)/(Total time) = (60 x 1/3 + 90 x 2/3)/1 = 80 Km/h.
Two grandfathers can nit a sweater in 6 days. Two grandfathers and one grandmother can nit a sweater in 3 days. How many days will it take the grandmother to nit a sweater all by her self?
Answer(s): D
Two grandfathers and a grandmother can nit a sweater in 3 days, therefore they can nit 2 sweaters in 6 days. Because two grandfathers can nit 1 in 6 days then the other sweater is done by the grandmother, she can nit 1 sweater in 6 days.
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