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nikklg [1K]
2 years ago
13

Please help this is for my son

Mathematics
2 answers:
Snezhnost [94]2 years ago
6 0

Total cookies both baked

\\ \tt\longmapsto \dfrac{1}{3}+\dfrac{2}{5}

\\ \tt\longmapsto \dfrac{5+6}{15}=\dfrac{11}{15}

Cookies left:-

\\ \tt\longmapsto 30-11/15(30)=30-22=8

Anuta_ua [19.1K]2 years ago
3 0

Answer:

8 cookies left to be baked

Step-by-step explanation:

<u>Len</u>

Len bakes 1/3 of 30 cookies

To find 1/3 of 30, divide 30 by 3 then multiply by 1:

\implies \frac{30}{3} \times1=10 \times 1=10

Therefore, Len bakes 10 cookies

<u>Sallesh</u>

Sallesh bakes 2/5 of 30 cookies

To find 2/5 of 30, divide 30 by 5 then multiply by 2:

\implies \frac{30}{5} \times2=6 \times 2=12

Therefore, Sallesh  bakes 12 cookies

<u>Cookies left to bake</u>

To calculate how many cookies are left to bake, subtract the found number of cookies Len and Sallesh have baked from 30:

30 - 10 - 12 = 8

So there are 8 cookies left to be baked.

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Peggy had three times as many quarters as nickels. She had $1.60 in all. How many nickels and how many quarters did she have?. .
Andru [333]

Let

n-------> the number of nickels

q------> the number of quarters

we know that

1\ quarter=\$0.25\\1\ nickel=\$0.05

so

0.05n+0.25q=1.60 ----> equation A

q=3n ----> equation B

substitute equation B in equation A

0.05n+0.25[3n]=1.60

0.05n+0.75n=1.60

0.80n=1.60

n=2

Find the value of q

q=3*2=6

therefore

<u>The answer part a) is</u>

the number of nickels are  2  and the number of quarters are 6

<u>the answer Part b) is</u>

The expressions that represents the number of quarters is

q=3n


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