cyndiann2002
18.12.2021 •
Mathematics
At a car service center, there is a discount of $20 if the service charges are above $100. The total charges before the discount for Jeff's car are $113.61. How much will Jeff have to pay? a).$133.61 b).$ 93.61 c).$ 80
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Ответ:
41
Step-by-step explanation:
Lets say blue marbles are B and yellow marbles are Y .
We know Y is twice B plus one, so Y = 2*B + 1
We also know that there are 61 marbles in total and there are only blue and yellow marbles, so
Y + B = 61 .
But wait, disnt we say Y = 2*B+1 ? Then we can rewrite that to:
2*B + 1 + B = 61
If we remove 1 from both sides, we get:
2*B + B = 60
Since 2*B = B+B, we know that B+B+B would be 3*B
So now we have 3*B = 60.
We divide both sides by 3 and we get B = 20
And then we go way back to Y being twice B plus one.
If B is 20, twice B would be 40. Plus one, 41.
So Y = 41
P.S. I found this on the internet!