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Comments (10)
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Topic:Mathematics skills 9
5/5 (8)
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sb
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9
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Nov 2020
sbsays...
Already stated in many ways.
B = Biscuits
C = Cookies
*B + 14 = Cookies "Because 14 more cookies than biscuits"
Also
*B + C = 38 "Because cookies plus biscuits totals to 38"
We know C = B+14
So we can substitude C with its longer version in the second equation: *B + (B+14) = 38 turns to-> B + B + 14 = 38, simplified it becomes 2B + 14 = 38.
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Comments (10)
Already stated in many ways.
B = Biscuits
C = Cookies
*B + 14 = Cookies "Because 14 more cookies than biscuits"
Also
*B + C = 38 "Because cookies plus biscuits totals to 38"
We know C = B+14
So we can substitude C with its longer version in the second equation: *B + (B+14) = 38 turns to-> B + B + 14 = 38, simplified it becomes 2B + 14 = 38.
2B + 14 = 38
2B = 38 - 14
2B = 24
B = 24 / 2
Biscuits = 12
*B + 14 = C
12 + 14 = 26
C = 26
Proof:
B + C = 38
12 + 26 = 38
Let 'c' be number of cookies and 'b' be number of biscuits:-c+b=38 and #c=14+b
14+b+b=38
b=12 and c+12=38:-c=26
38/2 = 19 . Then 14/2 = 7. So the answer 19+7=26
This should not be one of the ones marked as difficult, it is easier than some of the medium ones
You guys its a system of equations:
C=B+14
B+C=38