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3 years ago

PLZZZ NEED HELP!!!!!

Mathematics

1 answer:

cluponka [151]3 years ago

5 0

Ah usatestprep ok 90% of awnsers are C so pick C

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1. Jane saved up 20 coins, all nickels and

kompoz [17]

Answer:

10 nickels and 10 quarters

Step-by-step explanation:

Given

Number of coins: 20

Vaiue of coins = $3.00

Required

Number of Nickels and Quarters;

<em>Let N =Nickels and Q =Quarters</em>

The total coins is represented as:

$N + Q = 20$

1 nickel is equivalent to $0.05 and 1 quarter is equivalent to $0.25; So

$0.05N + 0.25Q = 3$

Make N the subject of formula in the first equation

$N = 20 - Q$

Substitute this in the second equation

$0.05(20 - Q) + 0.25Q = 3$

$1 - 0.05Q + 0.25Q = 3$

Collect like terms

$-0.05Q + 0.25Q = 3 - 1$

$0.2Q = 2$

Multiply both sides by 5

$5 * 0.2Q = 2 * 5$

$Q = 10$

Recall that N = 20 - Q

$N = 20 - 10$

$N = 10$

6 0

3 years ago

Please help if you can

NemiM [27]

I am doing this test I will do it and I will give you the correct answer when I am done I think it's the last one but I am not sure soo wit an tell I finish the test

3 0

3 years ago

The average of 5 numbers is 33. If the average of first 2 numbers is 35 and that of last 2 is 31, then find the 3rd number.

-BARSIC- [3]

The answer is c. 33.

3 0

3 years ago

Read 2 more answers

Mark did 2/5 of a job and Alan did 1/3 of the remainder. The fraction of the job left undone

Evgesh-ka [11]

2/5=4/10=12/30 1/3=10/30 12/30+10/30=22/30 22/30=11/15

4 0

3 years ago

50 + 34 x 6 - 23.

dolphi86 [110]

Answer: 231

Step-by-step explanation: We can use PEMDAS (parentheses, exponents, multiplication, division, addition, subtraction) in order. Multiply 34 and 6: 204.

50 + 204 - 23. Add 50 and 204: 254. Subtract 254 and 23: 231.

6 0

4 years ago