$$5670 \div (28 \times 13.5) =$$ ?
$$5670 \div (28 \times 13.5)$$
= $$5670 \div (28 \times (27/2))$$
= $$(5670\times 2) \div (28 \times 27)$$
= $$810 \times 2 \div (4 \times 27)$$
= $$90 \div (2 \times 3)$$
=15
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