mathematics
☼ Pipes ( may be inlet or may be outlet ) & Cisterns ( or tank or reservoir ) : If a pipe can fill a tank in x hrs. and another pipe can empty the full tank in y hrs ( where y > x ), then on opening both the pipes, the net […]
(5) If the wages of 12 men for 10 days be Rs. 2500, then find the wages of 15 men for 18 days.
Soln. M1 = 12 men, D1 = 10 days, W1 = Rs. 2500,
M2 = 15 men, D2 …
☼ Indirect Proportion : Two quantities are said to be indirectly proportional, if one the increase of the one, the other decreases proportionately.
e.g. (i) 10 men can do a piece of work in 6 days
∴ 15 …
☼ Direct Proportion : Two quantities are said to be directly proportional if on the increase or decrease of the one, the other increases or decreases proportionately.
e.g. (i) 7 ball pen cost Rs. 35
∴ 9 ” …
☼ Chain Rule : The method of finding the fourth proportional when the other three are given is called rule of three.
Repeated use of rule of three is called chain rule.
☼ Direct Proportion : Two quant…