exam Maths Puzzle Numerical Ability

please help solve this problem thank you in advance

You have at least $30 in change in your drawer, consisting of dimes and quarters. Write an inequality that shows the different number of coins in your drawer

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from a base elevation of 9100 ft a mountain peak rises to a summit elevation of 14465 ft over a horizontal distance of 15838. the Suppose you have a perfectly spherical water tank with an inside diameter of 8.6 metres. If the drain at the bottom of the tank can't handle a hydrostatic pressure of more than 50