exam Maths Puzzle Numerical Ability

When three coins are tossed what is the probability that they all land with a head showing? Round to 2 decimal places.

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exam Other Question

There were 40 students in a hostel. If the number of students increased by 5 the expenses of the mess were increased by Rs.45 per day while the averag expenditure per head diminish Please help me solve this equation:
c^2+2c-24=0