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There are 40 students in class 61 rowing. There are 5 people in each big boat and 3 people in the small boat. There are just 12 boats. How many boats are there in each big boat
There are x big boats and (12-x) small boats
5x+3（12-x）=40
5x+36-3x=40
2x+36=40
2x=4
x=2
12-x=10
A: there are 2 big boats and 10 small boats
A class of 26 students go to the park to row boats. There are two kinds of boats that can be rented. One is a big boat with 5 people for each boat, and the other is a small boat with 4 people for each boat
The rent is 14 yuan. How about the lowest cost?
26=4×4+5×2
There are four small boats and two big boats
A total of 14 × 4 + 20 × 2 = 96 yuan
There are 42 teachers and students going to the park to row. The big boat can do 6 people, and the small boat can do 4 people. They have rented 9 boats, which are just full. They have rented some big boats and some small boats
We rented x big boats and Y small boats
Simultaneous equations: 1. X + y = 9
2.6X+4Y=42
Just solve the equation
Or with the equation of one variable, let x big ships, then (9-x) small ships
6X+4(9-X)=42
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