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  20-cents 50-cents
Number of coins u 2u
Value of coins 20u = 20 x u 100u = 50 x 2u
Suppose there are the number of 20-cents is u.
Then we can fill up the table above as shown.

Therefore the value of the coins is 120u = 4800 cents.
Thus u = 40.

There are 3u = 3 x 40 = 120 coins.

Check: 40 x 0.2 + 80 x 0.5 = 8 + 40 = 48.

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