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Mama L [17]
3 years ago
12

Harold bought 3 pounds of red apples and 4.2 pounds of green apples from the store, where both kinds of apples are 1.75 a pound.

how much did harald spend on apples?
Mathematics
1 answer:
andrezito [222]3 years ago
7 0
The answer is.
Harold spent 12.6

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Let b_1,b_2,\ldots,b_{20} be the 20 marks of the boys, and g_1,g_2,\ldots,g_{10} be the 10 marks of the girls.

We know that the global mean was 70, meaning that

\dfrac{b_1+b_2+\ldots+b_{20}+g_1+g_2+\ldots+g_{10}}{30}=70

Multiplying both sides by 30 we deduce that the sum of the scores of the whole classroom is

b_1+b_2+\ldots+b_{20}+g_1+g_2+\ldots+g_{10}=2100

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