Answer:
Number of ducks = 37
Number of pigs = 18
Step-by-step explanation:
Let,
x be the number of ducks
y be the number of pigs
According to given statement;
x+y=55 Eqn 1
2x+4y=146 Eqn 2 (As ducks will have 2 legs and pigs will have 4)
Multiplying Eqn 1 by 2
2(x+y=55)
2x+2y=110 Eqn 3
Subtracting Eqn 3 from Eqn 2
(2x+4y)-(2x+2y)=146-110
2x+4y-2x-2y=36
2y=36
Dividing both sides by 2
Putting y=18 in Eqn 1
x+18=55
x = 55-18
x = 37
Hence,
Number of ducks = 37
Number of pigs = 18
X and y always equal 1 before u actually know what to actually substitute in for the letters. so if u dont kno then its just 1.
Answer:
7
Step-by-step explanation:
0.3r = 2.1
r = 2.1 ÷ 0.3
r = 7
It will help with taxes and construction and paying things, etc.
1/2x = 2x+14
-2x -2x
-1.5x = 14
-1.5 -1.5
x=93/10