Mensah is 5 years old and joyce is thrice as old as mensa...
Mensah is 5 years old and joyce is thrice as old as mensah. In how many years will joyce be twice as old as Mensah?
3 years
10 years
5 years
15 years
Correct answer is C
Mensah’s age is 5. Thus,
Joyce’s age is 15 (5*3=15)
The difference between their ages is 10 (15–5=10)
As we ought to find how many years Joyce’s age will be twice of Mensah’s age, we should write down the following :
15+X=2*(5+X)
15+X=10+2X lets add (-10-X) to both sides of the equation and
15+X-10-X = 10+2X-10-X
5=X —-> X=5
After 5 years Joyce’s age will be 20 (15+5=20)
After 5 years Mensah’s age will be 10 (5+5=10)
After 5 years Joyce will be twice as old as Mensah (10*2=20)
Factorize 9(x + y)2 - 4(x - y)2...
Let (*) be a binary operation on a natural number defined by a * b = a - b + (ab)2, then find 3...
Find the value of k if k√3+√2 = k√3−2...
Evaluate 81.81+99.4420.09+36.16 correct to 3 significant figures. ...
Marks 1 2 3 4 5 Frequency 2 2 8 4 4 The table above show the marks obtained in a given test...
Find the range of values of x for which 3x - 7 ≤ 0 and x + 5 > 0? ...
Find the mean deviation of 20, 25, 21, 27, 28, 29, to the nearest whole number ...
If 104x=68, find the value of x...
Find the equation of the tangent at the point (2, 0) to the curve y = x2 - 2x...