Ratio and probability?

a deck of cards contains red and black cards in the ratio 4:3 . if a card is picked at random what is the probability that it is red or:a deck of card

a deck of cards contains red and black cards in the ratio 4:3 . if a card is picked at random what is the probability that it is red

or:a deck of cards contains red and black cards in the ratio 4:3 . if a card is picked at random what is the probability that it is red

or:You would pick a red card 4 times out of seven, and a black card three times out of seven.

or:A deck of cards contains red and black cards in the ratio 4:3 .r := number of red cardsb := number of black cardsn := r + bTherefore, n is an integer multiple of 7 = 4 + 3.if a card is picked at random what is the probability P that it is red?P(r) = 4 / 7 = 0.5714... = 57.14%.

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