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3 years ago

5

A paper published in a medical journal reported that about 11/25 of girls ages 16-17 do not exercise at all. The entire study co

nsisted of about 2, 500 girls. About how many did not exercise?

1 answer:

Leni [432]3 years ago

3 0

1,400 girls from 16 to 17 do not exercise Step one 2,500÷25 =100 Step two 100×11 =1,100 Step three 2,500−1,100 =1,400

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3 years ago

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3 years ago

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Cross – multiplication method–

$\dfrac{x}{{{b_1}{c_2} - {b_2}{c_1}}} =\dfrac{y}{{{a_2}{c_1} - {c_2}{a_1}}} = \dfrac{1}{{{a_1}{b_2} - {a_2}{b_1}}} || x = \dfrac{{{b_1}{c_2} - {b_2}{c_1}}}{{{a_1} {b_2} - {a_2}{b_1}}} y = \dfrac{{{a_2}{c_1} - (c_2}{a_1}}}{{{a_1}{b_2}-{a_2}{b_1}}}\\$

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Therefore, the length is 17 and breadth is 9.

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3 years ago