How do u work out question 5?

Mathematics

1 answer:

allochka39001 [22]3 years ago

5 0

Cost of using the smaller tiles

Area = 210 * 90 = 18,900
Total number of tiles required = 18,900 / 100 = 189
That is 5/7 * 189 = 135 white tiles and 54 coloured tlles

Cost = 135*3.99 + 54*4.99 = £808.11

Larger Tiles:-
Total numbers of tiles = 18,900 / 225 = 84
= 5/7 * 84 = 60 white tiles and 24 coloured tiles

Cost = 60*8.99 + 24 * 9.99 = £779.16

So using the 15 cm square tiles would be cheaper.

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Two boys and three girls are auditioning to play the piano for a school production. Two students will be chosen, one as the pian

Sergio039 [100]

The answer is 0.24

To calculate this, a multiplication rule is used. The multiplication rule calculates the probability that both of two events will occur. In this method, the probabilities of each event are multiplied. Here we have two events:

1. The probability that the pianist will be a boy,

2. The probability that the alternate will be a girl.

So, let's calculate these probabilities:

There are in total 5 children:

2 boys + 3 girls = 5 children.

1. The probability that the pianist will be a boy is 2 boys out of 5 children, which is 2/5.

2. The probability that the alternate will be a girl is 3 girls out of 5 children, which is 3/5.

The probability that the pianist will be a boy and the alternate will be a girl is:

2/5 × 3/5 = 6/25

6/25 × 4/4 = 24/100 = 0.24

3 0

2 years ago