unicornqueen30
01.07.2019 •
Mathematics
X: y=5: 3 and x+y=56 work out the value of x-y
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Ответ:
x - y = 14
given the ratio x : y = 5 : 3
then let x = 5x and y = 3x, hence equation can be expressed as
5x + 3x = 56
8x = 56 ( divide both sides by 8 )
x = 7
Hence x = 5 × 7 = 35 and y = 3 × 7 = 21
Thus x - y = 35 - 21 = 14
Ответ:
Just out of curiosity is 3x+2y-12 meant to be equal to xy-6??