Mathematics: In a collection of nickels, dimes, and quarters worth $6.90, the ratio of the numbers of nickels to dimes is 3: 8. the ratio of the number of dimes to quarters is 4: 5. find the number of each type of coin. (hint: make a coin value chart.)

In a collection of nickels, dimes, and quarters worth

Ответ:

yhhh

07.01.2022

$3n=8d\\4d=5q\\8d=10q=3n\\0.05(3n)+0.1(8d)+0.25(10q)=6.90\\0.15n+0.8d+2.5q=6.90\\\\0.15+0.8+2.5=3.45\\\frac{6.90}{3.45}=2\\2(0.15n+0.8d+2.5q)-6.90\\0.05(6n)+0.1(16d)+0.25(20q)=6.90\\6n,16d,20q$

Six nickels, sixteen dimes, twenty quarters.

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Ответ:

JaylahtheSmarrtie

31.01.2022

Mathematics

(5 + x) + (5 + x + 2)

First, simplify 5 + x + 2 to x + 7. / Your problem should look like: 5 + x + x + 7
Second, simplify. / Your problem should look like: 5 + 2x + 7
Third, simplify. / Your problem should look like: 2x + 12

2x + 12

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In a collection of nickels, dimes, and quarters worth $6.90, the ratio of the numbers of nickels to dimes is 3: 8. the ratio of the number of dimes to quarters is 4: 5. find the number of each type of coin. (hint: make a coin value chart.)

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