Three students have done a total of 20 math problems. If B does one more problem, it will be twice as many as a. if a does five less problems than C, how many math problems did each of the three students do

Three students have done a total of 20 math problems. If B does one more problem, it will be twice as many as a. if a does five less problems than C, how many math problems did each of the three students do

Let a do X, B 2x-1, C x + 5
x+2x-1+x+5=20
x=4
2x-1=7
x+5=9
Four for a, seven for B and nine for C

One day, a, B and C do math problems. It is known that a has done 6 more than B, and C has done 2 times as much as a, 22 more than B, so they have done all of them______ A math problem

Let B do X questions. From the meaning of the questions, we can get: (x + 6) × 2 = x + 22, & nbsp; & nbsp; & nbsp; 2x + 12 = x + 22, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 10; a: 10 + 6 = 16 (DAO); C: 16 × 2 = 32 (DAO); all: 10 + 16 + 32 = 58 (DAO); a: they have done 58 math questions. So the answer is: 58

Three students of a, B and C do math problems. They know that a does 5 more than B, and C does 2 times as much as a, 20 more than B. how many math problems have they done
The method of not setting x is required

A does five more than B,
C does 20 more than B,
Then C did 20-5 more than a = 15
It is known that C does twice as much as a, and a does 15
B did 15-5 = 10
C did 10 + 20 = 30