Exercices a pratiquer Flashcards
If Jake loses 8 pounds, he will weigh twice as much as his sister. Together they now weigh 278 pounds. What is Jake’s present weight, in pounds?
A) 131
(B) 135
(C) 139
(D) 147
(E) 188
Essayer en plug et algébrique
At least 2/3 of the 40 members of a committee must vote in favor of a resolution for it to pass. What is the greatest number of members who could vote against the resolution and still have it pass?
(A) 19
(B) 17
(C) 16
(D) 14
(E) 13
At his regular hourly rate, Don had estimated the labor cost of a repair job as $336 and he was paid that amount. However, the job took 4 hours longer than he had estimated and, consequently, he earned $2 per hour less than his regular hourly rate. What was the time Don had estimated for the job, in hours?
(A) 28
(B) 24
(C) 16
(D) 14
(E) 12
Esssayer deux methodes
A store currently charges the same price for each towel that it sells. If the current price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $120, excluding sales tax. What is the current price of each towel?
(A) $1
(B) $2
(C) $3
(D) $4
(E) $12
Utiliser les facteurs premiers: si p est facteur de 120, alors p+1 aussi. Evident que p = 2, 3 ou 4. puis tester.
A certain fruit stand sold apples for $0.70 each and bananas for $0.50 each. If a customer purchased both apples and bananas from the stand for a total of $6.30, what total number of apples and bananas did the customer purchase?
(A) 10
(B) 11
(C) 12
(D) 13
(E) 14
Que retenir de cet exercice?
What is the greatest prime factor of 12!11! + 11!10!?
(A) 2
(B) 7
(C) 11
(D) 19
(E) 23
Utiliser les reponses pour parvenir a une solution. Ici:
19 et 23 donne deux facteurs potentiels de 133
