The answer to this very unique and wonderful math equation or problem is simply the answer of the variable y = 7
Answer:
£62.4
Step-by-step explanation:
There are 104 coins in a bottle 1/2 of the coins are £1 coins
Hence:
1/2 × 104 coins = 52 coins
Since 1/2 of the coins are £1 coins
Hence
52 coins = £52
The remaining the rest of the coins are 20p coins
The rest = 1/2 of 104 coins = 52 coins
Note that:
100 pence = 1£
Hence:
100p = 1 £
20p = x
Cross Multiply
100p × x = 20p × £1
x = 20p × £1 /100p
x = £0.2
So, one 20p coin = £ 0.2
Hence:
one 20p coin = £ 0.2
52 20p coins = x
Cross Multiply
x = 52 × £0.2
x = £10.4
The total value for the 104 coins is
= £52 + £10.4
= £62.4
Answer:
3 student.
Step-by-step explanation:
From the first statement:
Let the total score be T
Let the total number of student be x
The average of the score = 72
Average = Tota score / number of student
72 = T/x
Cross multiply
T = 72x ..... (1)
Second statement:
One more student took the test and the average becomes 76 with the student having a score of 88.
Therefore,
Overall score = T + 88
Total student = x + 1
Average = 76
Average = overall score / total number of student
76 = (T + 88) /(x + 1)
Cross multiply
76(x + 1) = T + 88
Clear bracket
76x + 76 = T + 88
From equation 1
T = 72x
76x + 76 = 72x + 88
Collect like terms
76x – 72x = 88 – 76
4x = 12
Divide both side by the coefficient of x i.e 4
x = 12/4
x = 3
Therefore, the initial number of the student were 3.