Advertisements
Advertisements
Question
If the cost of a dozen soaps is Rs 285.60, what will be the cost of 15 such soaps?
Solution
Cost of dozen soaps = Rs 285.60
Cost of 1 soap = `285.60/12`
Cost of 15 soaps = 15 × `285.60/12 = 4284/12` = Rs 357
APPEARS IN
RELATED QUESTIONS
Using properties of proportion, solve for x:
`(sqrt(x + 1) + sqrt(x - 1))/(sqrt(x + 1) - sqrt(x - 1)) = (4x - 1)/2`
If three quantities are in continued proportion, show that the ratio of the first to the third is the duplicate ratio of the first to the second.
If a, b, c are in proportion, then
If a, b, c are in continued proportion, prove that: a2 b2 c2 (a-4 + b-4 + c-4) = b-2(a4 + b4 + c4)
What number must be added to each of the numbers 15, 17, 34 and 38 to make them proportional?
Do the ratios 15 cm to 2 m and 10 sec to 3 minutes form a proportion?
If b : a = c : d, then a, b, c, d are in proportion.
Write True (T) or False (F) against the following statement:
0.9 : 0.36 : : 10 : 4
If x, y and z are in continued proportion, Prove that:
`x/(y^2.z^2) + y/(z^2.x^2) + z/(x^2.y^2) = 1/x^3 + 1/y^3 + 1/z^3`
The mean proportion between `3 + 2sqrt(2)` and `3 - 2sqrt(2)` is ______.
