exam Maths Puzzle Numerical Ability

givin am+cn
Mb=Nd

Prove ab+cd

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Number Problems= You have at least $30 in change in your drawer, consisting of dimes and quarters. Write an inequality that shows the diffrent number of coins in your drawer. How do I simplify this and express in scientific notation:

The ratio 35,960,000 miles : 3,664,000,000 miles, the ratio of the distance of the sum from Mercury to its distance from Pluto

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