I spent 3/4 of my money and then I spent 1/5 of what was left Everybody keeps saying that it is 11/20 but that is NOT CORRECT

Thank you!

Money spent = 3/4

money left = 1-(3/4) = 1/4

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again 1/5 spent of 1/4 (remaining money) = 1/20

means again money was spent = 1/20

total money spent = 1/4 + 1/20 = 6/20 = 3/10 of total

now, total money left = 1 - (3/10) = 7/10

hence, 7/10 part of total money is left after all expenditure!

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in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it