What will come in place of question mark (?) in the following questions ?
To find the value of the expression $$\frac{5}{9} of 504+ \frac{3}{8} of 640$$, let us find the value of the individual elements first.
$$\frac{5}{9} \times 504 = 5 \times 56 = 280$$
$$\frac{3}{8} \times 640 = 3 \times 80 = 240$$
So, the sum equals $$280 + 240 = 520$$
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