In a fuel station the service costs $1.15 per car, every liter of fuel costs 0.4$. Assuming that you own 2 sports cars and 2 executive cars and all fuel tanks are empty. How much will it cost to fuel all cars together if a sports car tank is 32 liters and an executive car tank is 75% bigger?
Answer(s): B
The cost of fuel per a sports car is: 1.15 + 32 x 0.4 = 13.95 $.The cost of fuel per an executive car is: 1.15 + (32 x 1.75) x 0.4 = 1.15 + 56 x 0.4 = 23.55 $. The sum of the fuel price is: 13.95 x 2 + 23.55 x 2 = 75$
In a fuel station the service costs $2.05 per car, every liter of fuel costs 0.6$. Assuming that you fill up 3 mini- vans and 2 trucks, how much money will the fuel cost to all the cars owners total, if a mini-van’s tank is 65 liters and a truck’s tank is 120% bigger and they are all empty-?
Answer(s): D
The cost of fuel per mini-van is: 2.05 + 65 x 0.6 = 41.05$.The cost of fuel per an executive car is: 2.05 + (65 x 2.20) x 0.6 = 2.05 + 143 x 0.6 = 87.85 $. The sum of the fuel price is: 3 x 41.05 + 2 x 87.85 = 298.85$
The average (arithmetic mean) of eight numbers is 44.1. If the sum of half of these numbers is 158.4, what is the average of the other half?
Answer(s): C
This is an average problem, so use the average formula. If the average of 8 numbers is 44.1, we can solve for their sum: 8 × 44.1 = 352.8. If four of these numbers total 158.4, then by subtracting 158.4 from 352.8, we get the sum of the other four numbers, 194.4. To find the average of these 4 numbers, we divide their sum by their number: 194.4/4 = 48.6.
Eric, Nick and Archi make contributions to the Society Of Nature Protection in the ratio of 5:3:2.5. If altogether they contribute 5145 Nis, how much more money does Nick contribute than Archi?
Add the numbers in the ratio 5:3:2.5 = 10.5. Divide the 5145 by 10.5 and you get the basicUnit = 490 Nis. Nick contributes 0.5 more units than Archi, and since each unit is 490, he contributed 245 Nis more.
Of 70 players on a football team, 37 are throwers. The rest of the team is divided so one third are left-handed and the rest are right handed. Assuming that all throwers are right handed, how many right-handed players are there total?
70 – 37 are the rest. Meaning that 33/3 = 11 are left-handed. The overall number of right handed: 37 + 22 = 59.
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