Question
The ratio of the present age of A to B is 5:7. After 6
years, the sum of their ages will be 72 years. Find the present age of A.Solution
Let the present age of A be 5x and the present age of B be 7x. After 6 years, their ages will be (5x + 6) and (7x + 6). The sum of their ages after 6 years = 72, so: (5x + 6) + (7x + 6) = 72, 12x + 12 = 72, 12x = 60, x = 5. Present age of A = 5x = 5 × 5 = 25 years.
Which of the following is an example of symbiosis?
What is the product of the reaction?
CH₃COOH + CH₃OH → (H⁺, heat)
In a nuclear reactor, one of the following is used as a fuel.
1 mole of carbon atoms = ______ g of carbon atoms
Two capacitors of capacitance 6 µF and 3 µF are connected in series across a battery of constant voltage.
The charges stored on the two capaci...
Group number and valency have no relation in
In Bohr’s model of the hydrogen atom, electrons in “stationary” orbits do not emit radiation continuously because:
The primary reason that smoking cigarettes is bad for our health is that cigarette smoke _______.
Chemical equation is balanced according to the law of
Consider the following statements regarding antibiotics
1. They are used to destroy disease-causing bacteria.
2. They can be applied to th...
