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BriTheKueen
01.11.2019 •
Mathematics
4if alice gives susan £6.00 the money they each have is in the
ratio 2: 1; however, if susan gives alice £1.00 the ratio is 1: 3.
how much money have alice and susan each before they
exchange any money?
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Ответ:
Alice and Susan have £62 and £22 respectively before the exchange.
Step-by-step explanation:
Let
A =Alice's total amount before exchange
S= Susan's total amount before exchange
if Alice gives Susan £6.00 and ratio become 2:1
Then (A-6)/(S+6) = 2/1
A-2S=18 eqn(1)
if Susan gives Alice £1.00 and ration becomes 3:1
then (A+1)/(S-1) =3/1
3A-S= -4 eqn (2)
solving eqn(1) and eqn(2) simultaneously
Ответ:
86 cm
Step-by-step explanation:
We are given that
Billiard ball travels before ricocheting off a rail=100 cm
After ricocheting ball travels=120 cm
The angles between the path as the ball approaches the rail and the path after strikes the rail=45 degrees
We have to find the distance between corner pocket from where cue initially struck the ball.
Cosine law:![c^2=\sqrt{a^2+b^2-abcos\theta}](/tpl/images/0449/3399/1febc.png)
By using cosine law
Hence, the distance of cornet pocket form where the cue initially struck the ball=86 cm