The ratio of the income to the expenditure of a family is 10:7. If the family's expenses are Rs. 10,500, then savings of the family is
Let's say income is $$10x$$ and expenditure is $$7x$$.
Saving will be $$3x$$
As expenditure is 10500=$$7x$$
            or $$x$$ = 1500
Hence saving will be $$1500 \times 3 = 4500$$
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