let the test tube be y and beakers be x
now 3x+4y=560
2x+5y=490
2(3x+4y=560) = 6x+8y=1120
3(2x+5y=490) = 6x+15y=1470
subtract 6x-6x=0
8y-15y=-7y
1120-1470=-350
thus -7y=-350, find y, y=-350/-7, y=50,
replace the value y 3x+4(50)=560, 3x+200=560
collect like terms 3x=560-200, 3x=360, x=120
so, one test tube cost ksh.50 and one beaker costs ksh.120
neptune answered the question on November 21, 2017 at 07:05
- Use tables of logarithms to evaluate. (Solved)
Use tables of logarithms to evaluate.
$\frac{4.28 \times 0.01677}{tan 20^o}$
Date posted: November 20, 2017. Answers (1)
- Find dy/dx,let y=x^2+3. ...(Solved)
Find dy/dx,let y=x^2+3.
Date posted: November 18, 2017. Answers (1)
- Define the following terms as used in real analysis..1.a set,2.cardinality ,3.null sets, 4.equal sets(Solved)
Define the following terms as used in real analysis..1.a set,2.cardinality ,3.null sets, 4.equal sets
Date posted: November 18, 2017. Answers (1)
- What are real numbers (Solved)
What are real numbers
Date posted: November 18, 2017. Answers (1)
- Find the perimeter of a square lawn whose area is 81 cm^2(Solved)
Find the perimeter of a square lawn whose area is 81 cm^2
Date posted: November 17, 2017. Answers (1)
- If theta lies between 0 and 360 and sin theta = 0.5, find the two possible values of theta(Solved)
If theta lies between 0 and 360 and sin theta = 0.5, find the two possible values of theta.
Date posted: November 16, 2017. Answers (1)
- Truncate the following to three decimal places.
a. 1/3
b. 21.47321
c. 523.7946
d. 0.0007678
(Solved)
Truncate the following to three decimal places.
a. 1/3
b. 21.47321
c. 523.7946
d. 0.0007678
Date posted: November 16, 2017. Answers (1)
- Form the quadratic equations whose roots are:
a. -2 and 3
b. -7 and 11
(Solved)
Form the quadratic equations whose roots are:
a. -2 and 3
b. -7 and 11
Date posted: November 16, 2017. Answers (1)
- The initial cost of a ranch is 50 000 000. At the end of each year, the land increase by 2%. What will...(Solved)
The initial cost of a ranch is 50 000 000. At the end of each year, the land increase by 2%. What will be the value of ranch at the end of 3 years?
Date posted: November 16, 2017. Answers (1)
- A minibus cost sh 4000000. Due to wear and tear, it depreciated in value by 2% every month. Find its value after one year.(Solved)
A minibus cost sh 4000000. Due to wear and tear, it depreciated in value by 2% every month. Find its value after one year.
Date posted: November 16, 2017. Answers (1)
- An iron box costs sh. 5000. Every years it depreciated by 10% of its value at the beginning of that year. What will its...(Solved)
An iron box costs sh. 5000. Every years it depreciated by 10% of its value at the beginning of that year. What will its value be after 4 years?
Date posted: November 16, 2017. Answers (1)
- Find the rate per annum at which a certain amount of money triples after being invested for a period of 5 years compounded annually.(Solved)
Find the rate per annum at which a certain amount of money triples after being invested for a period of 5 years compounded annually.
Date posted: November 16, 2017. Answers (1)
- A businessman wants to have sh. 40000 in 8 years. How much money must he invest now if the rate of interest is 7.5% p.a....(Solved)
A businessman wants to have sh. 40000 in 8 years. How much money must he invest now if the rate of interest is 7.5% p.a. compound interest?
Date posted: November 16, 2017. Answers (1)
- Find the accumulated amount if sh. 40000 is deposited for 4 ½ years at 10% p.a. compound interest.(Solved)
Find the accumulated amount if sh. 40000 is deposited for 4 ½ years at 10% p.a. compound interest.
Date posted: November 16, 2017. Answers (1)
- What would sh. 30000 amount to after three years at 16% p.a. compounded quarterly?(Solved)
What would sh. 30000 amount to after three years at 16% p.a. compounded quarterly?
Date posted: November 16, 2017. Answers (1)
- The equation of a straight line L1 is given by 2y + 8x - 10 = 0. Another line L2 cuts L1 at right angles...(Solved)
The equation of a straight line L1 is given by 2y + 8x - 10 = 0. Another line L2 cuts L1 at right angles such that the point of intersection of the two lines has coordinates (-3,k).
(a) Find the value of k
(b) Hence find the equation of L2
Date posted: November 16, 2017. Answers (1)
- Find the amount at the end of the fourth year if sh. 60000 is deposited at 15% p.a. compound interest.(Solved)
Find the amount at the end of the fourth year if sh. 60000 is deposited at 15% p.a. compound interest.
Date posted: November 16, 2017. Answers (1)
- Find the amount after 2 years if sh. 10000 is invested at 20% p.a. compound interest.(Solved)
Find the amount after 2 years if sh. 10000 is invested at 20% p.a. compound interest.
Date posted: November 16, 2017. Answers (1)
- John invested a certain amount of cash in a bank which paid 12% p.a. simple interest. After 10 years, his total saving were sh. 10000....(Solved)
John invested a certain amount of cash in a bank which paid 12% p.a. simple interest. After 10 years, his total saving were sh. 10000. Determine the amount of money he invested initially.
Date posted: November 16, 2017. Answers (1)
- Calculate the rate of interest if sh. 9000 earns sh. 1000 after sh. 9000 earns sh. 1000 after 1 ½ years.(Solved)
Calculate the rate of interest if sh. 9000 earns sh. 1000 after sh. 9000 earns sh. 1000 after 1 ½ years.
Date posted: November 16, 2017. Answers (1)