Sagot :
x + y = 23
y = 23 - x
Number of fruits:
x = oranges
y = apples or 23-x = apples
Cost of fruits:
15 (x) = oranges
18 (23-x) = apples
Equation:
15 (x) + 18 (23-x) = 378
15x + 414 - 18x = 378
15x - 18x = 378 - 414
18x - 15x = 414 - 378
3x = 36
3x/3 = 36/3
x = 12
Substitute 12 to x in number of fruits:
Oranges: x = 12
Apples: 23-12 = 11
ANSWER: 11 apples.
Check:
15 (12) + 18 (11) = 378
180 + 198 = 378
378 = 378
y = 23 - x
Number of fruits:
x = oranges
y = apples or 23-x = apples
Cost of fruits:
15 (x) = oranges
18 (23-x) = apples
Equation:
15 (x) + 18 (23-x) = 378
15x + 414 - 18x = 378
15x - 18x = 378 - 414
18x - 15x = 414 - 378
3x = 36
3x/3 = 36/3
x = 12
Substitute 12 to x in number of fruits:
Oranges: x = 12
Apples: 23-12 = 11
ANSWER: 11 apples.
Check:
15 (12) + 18 (11) = 378
180 + 198 = 378
378 = 378
let x = no of oranges
23 - x = no. of apples
Cost of fruits:
15 (x) = oranges
18 (23-x) = apples
Equation:
15 (x) + 18 (23-x) = 378
15x + 414 - 18x = 378
15x - 18x = 378 - 414
18x - 15x = 414 - 378
3x = 36
[tex] \frac{3x}{3} = \frac{36}{3} [/tex]
x = 12
Substitute 12 to x in number of fruits:
Oranges: x = 12
Apples: 23-12 = 11
Answer: 11 apples.
Check:
15 (12) + 18 (11) = 378
180 + 198 = 378
378 = 378
23 - x = no. of apples
Cost of fruits:
15 (x) = oranges
18 (23-x) = apples
Equation:
15 (x) + 18 (23-x) = 378
15x + 414 - 18x = 378
15x - 18x = 378 - 414
18x - 15x = 414 - 378
3x = 36
[tex] \frac{3x}{3} = \frac{36}{3} [/tex]
x = 12
Substitute 12 to x in number of fruits:
Oranges: x = 12
Apples: 23-12 = 11
Answer: 11 apples.
Check:
15 (12) + 18 (11) = 378
180 + 198 = 378
378 = 378