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2 years ago

I NEED HELP PLZZZ

Mathematics

2 answers:

quester [9]2 years ago

6 0

24x is gonna be your answer

marishachu [46]2 years ago

4 0

Answer:

Actual distance = 24 km

Step-by-step explanation:

16 cm

2cm = 3 km

We could use a ratio to do this

16/2 = x/3

8=x/3

Multiply both sides by 3

24=x

Hope this helps :)

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1) Helen is 8 years older than Jane. Twenty years ago Helen was three times as old as Jane. How old is each now and what is the

Mice21 [21]

Answer:

Part 1) Helen's age is 32 years old and Jane's age is 24 years old

Part 2) 13 twenty-dollar bills

Step-by-step explanation:

Part 1) Helen is 8 years older than Jane. Twenty years ago Helen was three times as old as Jane. How old is each now and what is the equation?

Let

x----> Helen's age

y---> Jane's age

we know that

x=y+8 ----> equation A

(x-20)=3(y-20) -----> equation B

substitute equation A in equation B and solve for y

(y+8-20)=3(y-20)

y-12=3y-60

3y-y=60-12

2y=48

y=24 years

Find the value of x

x=y+8

x=24+8=32 years

Part 2)

Let

x-----> the number of five-dollar bills

y----> the number of twenty-dollar bills

we know that

5x+20y=305 -----> equation A

y=x+4 ------> x=y-4 ------> equation B

substitute equation B in equation A and solve for y

5(y-4)+20y=305

5y-20+20y=305

25y=325

y=13 twenty-dollar bills

Find the value of x

x=y-4

x=13-4=9 five-dollar bills

5 0

3 years ago

How many minutes and seconds worth of songs do you have?

PolarNik [594]

Question 1:

48 + 63 + 28 + 44 + 43 = 226 minutes

41 + 40 + 15 + 1 + 39 = 136 seconds

136 seconds = 2 minutes and 16 seconds

The answer is 228 minutes and 16 seconds.

Question 2: 228 minutes = 3 hours and 48 minutes

The answer is 3 hours and 48 minutes, but if you're also counting seconds, add 16 seconds to the end of it.

7 0

2 years ago

Read 2 more answers

pls solve quickly!: It took a boat 2 hours to reach town A going upstream. The way back was 1h20 min. What is the speed of the b

goldenfox [79]

Answer:

15 mph

Step-by-step explanation:

Given: Boat took 2 hours to reach Town A going upstream.

Speed of stream= 3 mph

Time taken to reach back home= 1 hours 20 minutes

Lets assume distance covered one side be "d" and speed of boat in still water be "s".

∴ Speed of boat in upstream= $(s-3) \ mph$

Speed of boat in downstream= $(s+3)\ mph$

Also converting into fraction of time taken to reach back home.

Remember; 1 hour= 60 minutes

∴ Time taken to reach back home= $60+20= 80\ minutes$

Converting time given into fraction= $\frac{80\ minutes}{60\ minutes} = \frac{4}{3} \ hours$

hence, Time taken to reach back home is $\frac{4}{3} \ hours$

Now forming equation of boat travelling upstream and downstream, considering distance remain constant.

We know, $Distance= speed \times time$

⇒ $(s-3)\times 2= (s+3)\times \frac{4}{3}$

Using distributive property of multiplication

⇒ $2s-6= \frac{4}{3}s +4$

subtracting both side by $\frac{4}{3} s$

⇒ $2s-\frac{4}{3} s-6= 4$

Adding both side by 6

⇒ $2s-\frac{4}{3} s= 10$

taking LCD as 3

⇒ $\frac{2}{3} s= 10$

Multiplying both side by $\frac{3}{2}$

⇒ $s= \frac{3}{2} \times 10$

∴s= 15 mph

Hence, 15 mph is the speed of the boat in still water.

8 0

3 years ago

Write as a numeral: Twenty-three and 10/100

murzikaleks [220]

23 10/100 is how you would write it

3 0

3 years ago

Read 2 more answers

Jessica's heart beats 12 times in 1/6 minute how many times does her heart beat each minute

Charra [1.4K]

Answer:

Step-by-step explanation:

12 6 times equals 72.

12x6=72

4 0

3 years ago