Rafael and Roger played tennis against each other 30 times. Each of the times they played, either Rafael won or Roger won. The ratio of the number of times Rafael won to the number of times Roger won is 7:3
(a) Work out the number of times Rafael won.

Rafael won 21 times.

Step-by-step explanation:

Add 7 + 3 together = 10

30 divided by 10 = 3

3 x 7 = 21

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %