Question
Ten years from now, the ages of A and B will be in a
ratio of 7:9. C's current age is half of B's current age. Five years from now, the ratio of C's age to D's age will be 3:4. If the average of C's and D's current ages is 16, what is A's current age?Solution
C + D=32 years After 5 years=32 + 10 =42 years 7x=42 years x= 6 years C=3 * 6= 18 years C’s present age=18 – 5 =13 years B’s present age=13 * 2 =26 years After 10 years B’s age=26 + 10 =36 years A’s age after 10 years=7 / 9 *36 =28 years A’s present age=28 – 10 =18 years
Find the resistance when a current of 2 A flows under a voltage of 10 V.
Ultrasonic pulse echo technique, a non-destructive ultrasonic testing, is employed for any possible flaw detection in a metallic bar of thickness 30 cm...
A solid non-conducting sphere of radius R carries a uniform volume charge density ρ. What is the ratio of electric field at r = R (surface) to that at ...
Gamma rays have greatest similarity with –
When a cannonball is fired, its motion is an example of which type of motion?
Hyperrnetropia or longsight can be corrected by using :
What is the main effect of increasing the temperature of a gas at constant volume?
What is the phenomenon of light splitting into colors when passing through a prism?
Which of the following is not a vector quantity?
Which of the following statements is true for a conductor in an electric field?