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3 years ago

Thirty students have planned picnic. The ratio of girls to boys is 3 : 7. How many boys are there?

Mathematics

2 answers:

noname [10]3 years ago

7 0

10 i think sorry if its worng

marshall27 [118]3 years ago

5 0

Answer:

Step-by-step explanation:

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What is 0.08 10 times as much

RSB [31]

Well...
0.08
X 10
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0.80

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3 years ago

Nata [24]

Answer: 15, -8

Step-by-step explanation:

$u_2=7\\u_2=u_1+r\\u_3=u_1+2r\\u_4=u_1+3r\\\\u_1+u_2+u_3+u_4=4u_1+6r=12\\u_1+r=7\\\\$

$\left \{ \begin {array} {ccc|c|c}u_1+r&=&7&-4&-6\\4u_1+6r&=&12&1&1\\\end {array} \right.\\\\\\\left \{ \begin {array} {ccc}2r&=&-16\\-2u_1&=&-30\\\end {array} \right.\\\\\\\left \{ \begin {array} {ccc}r&=&-8\\u_1&=&15\\\end {array} \right.\\\\\\Proof:\\u_1=15\\u_2=7\\u_3=-1\\u_4=-9\\sum=12\\$

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3 years ago

What are the answers

gulaghasi [49]

Answer and Step-by-step explanation:

7. 70 - 180 = 110

8. 39 - 180 = 141

9. 81 - 180 = 99

10. 81 - 180 = 99

11. 115 - 180 = 65

12. 41+36 = 77 - 180 = 103

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schepotkina [342]

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Step-by-step explanation:

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3 years ago

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adell [148]

Answer:

Theirs no picture evidence

Step-by-step explanation:

Please explain your questions better

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