Sunday

February 1, 2015

February 1, 2015

Posted by **Bri** on Wednesday, February 16, 2011 at 8:45pm.

1.a certain two-digit number has a value that is seven more than six times the sum of its digits. the tens digit is 3 more than the units digit. find the number

2.In Colorado Creek, Darrell can row 24km downstream in 6 hours or he can row 18km upstream in the same amount of time. find the rate he rows in still water and the rate of the current.

3. if the temperature on a Celsius scale is divided by five it is equal to the reading on a Fahrenheit scale. fifteen times the Fahrenheit reading is equal to three times the Celsius reading. please find the temperature on each scale.

- algebra -
**Dallas**, Friday, March 4, 2011 at 1:28am2.) distance = time × speed

Let rowing speed in still water be x, current in river be y

Downstream, speed is his natural rowing speed plus the current:

24 = 6(x + y)

Upstream, speed is natural rowing speed minus current:

18 = 6(x - y)

or

4 = x + y

3 = x - y

Add

7 = 2 x

x = 7/2 km/h (and current is 1/2 km/h)

He can row at 3.5 km/h

**Answer this Question**

**Related Questions**

algebra - The value of a certain two-digit number is eight times he sum of its ...

Algebra math. - 1) the sum of the digits of a two digit number is 9. The value ...

Grade 8 Math - Can you write them in Mathematical/numbers form I'll solve them ...

Algebra 1--Please, help me! - 4. The sum of the digits of a two-digit number is ...

math - the sum of two numbners is 143. on of the numbers is 3 more than six ...

Algebra - The units digit of a two-digit number is two more than four times the ...

exploring mathematics elementary algebra - the sum of the digits of a two-digit ...

maths - Find the sum of all 3-digit positive numbers N that satisfy the ...

tres ninos school - exploring mathematics elementary algebra....the sum of the ...

word problem - the different between the digit of a two digit number is 1, the ...