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Juliette [100K]
3 years ago
7

George buys some first class and second class stamps to put on some letters. Each first class stamp costs 67p, and each second c

lass stamp costs 58p. The ratio of first to second class stamps is 1:4. George bought 320 stamps. How much did George pay for all the stamps?
Mathematics
1 answer:
Dafna1 [17]3 years ago
3 0

Answer:

£191.36

Step-by-step explanation:

Sum the parts of the ratio, 1 + 4 = 5 parts

Divide 320 by 5 to find the value of one part of the ratio.

320 ÷ 5 = 64 ← value of 1 part of the ratio , thus

4 parts = 4 × 64 = 256

Thus he bought 64 first class and 256 second class.

Cost = (64 × £0.67) + (256 × £0.58)

        = £42.88 + 148.48

        = £191.36

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valentinak56 [21]

The value of x is 1.66

Step-by-step explanation:

Let use revise the rules of exponential and logarithmic equations

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Use the rules above to solve the problem

∵ 4^{x}+2=12

- Subtract 2 from both sides

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change the exponential equation to logarithmic equation

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4 years ago
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Veronika [31]

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3 years ago
What is the perimeter of the triangle shown on the coordinate plane,to the nearest tenth of a unit ?
ollegr [7]

Answer:

25.6 units

Step-by-step explanation:

From the figure we can infer that our triangle has vertices A = (-5, 4), B = (1, 4), and C = (3, -4).

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suter [353]
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