2(方程) .If the sum of three consecutive integers is -21,Find the largest integer.
3(方程). The weight of a cat is 0.3kg more than 12 times that of a rat , while the weight of a dog is 0.2 kg less than 14 times that of the rat. If the weight of the cat and the dog are the same,
(a) what weight in kg is the rat ?
(b) what weight in kg is the cat?
4.(方程)In an exhibition , the prices of an adult ticket and a student ticket are $75 and $30 respctively. If on a day 490 tickets are sold altogether and then total incomes is $30450,find
(a)the number of adult tickets sold and the amount received
(b)the number of student tickets sold and the amount received
- 9 years agoFavorite Answer
let the largest integer be x
therefore, the largest integer is -6
let the weight of the rat be y kg
therefore,the weight of the rat is 0.25kg
let the number of adult tickets and student tickets sold be x and y respectively
sub (3) into (2),
therefore,the number of adult tickets sold is 350.
therefore, the amount received by selling adult tickets is $26250
sub x=350 into (1)
therefore,the number of student tickets sold is 140.
therefore, the amount received by selling student tickets is $4200
2011-10-30 12:49:55 補充：
- 9 years ago
3a = -27
a = -9
so the largest integer is -9 +3 = -6Source(s): me