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Mathematical solution to the equation A tea is 128 yuan per kilogram, B tea is 98 yuan per kilogram. The two kinds of tea are 12 kg in total. It costs 46 yuan less to buy a tea than B tea. How many kg of each kind of tea do you buy?
Let a have x kg, and B have 12-x kg
128X+46=98(12-X)
128X+46=1176-98X
128X+98X=1176-46
226X=1130
X=5
12-5=7
There are 5 kg for type A and 7 kg for type B
Chicken and rabbit in the same cage (mathematical equation)
A group of ducks ran to the sheepfold. Now there are 13 heads and 32 feet in the sheepfold. How many ducks and sheep are there?
(equation, must have solution and suppose)
be careful! One yuan a time! It's not two dollars at a time
Suppose there are x sheep, then there are (13-x) ducks. 4x + 2 (13-x) = 324x + 2x13-2xx = 324x + 26-2x = 32
Some 2-cent and 5-cent coins have a total of 299 cents, of which the number of 2-cent coins is four times that of 5-cent coins, and 5-cent coins have a total of 299 cents______ One
Let 5 have X, then 2 have 4x; from the meaning of the question, we can get: 4x × 2 + 5x = 299, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 13X = 299, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 23; answer: there are 23 5 points; so the answer is: 23
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