A father said to his son, "I was as old as you are at the present at the time of your birth". If the father's age is 52 years now, what was the son's age twenty three years back?
Let the sons current age be x
So fathers age x years back when son was born => 52-x = x
Solving we get x = 26
21 Years back son's age = 26-23 = 3 years
Divide Rs. 9516 into 3 parts so that their amount after 2,3 and 4 years respectively may be equal, the rate of interest being 5% per annum at simple interest. The product of first and third part is
Let the parts be x, y and z
x + (x * 2 * 5/100) = y + (y * 3 * 5/100) = z + (z * 4 * 5/100)
11x/10 = 23y/20 = 6z/5 = k
x = 10k/11, y = 20k/23, z = 5k/6
But x + y + z = 16653
10k/11 + 20k/23 + 5k/6 = 9516
k = 3643.2
x*z = (10/11)*3643.2 * 5/6*3643.2= 10055232
Option 9)
A shopkeeper marks up his goods by 35% and gives a discount of 20%. Apart from this, he uses a faulty balance also, which reads 1000 gm for 850 gm. What is his net profit percentage?