Question

X+15%din X =345; X= ?
X-91%din X = 1872; X= ?
Ofer Coroana si 100 puncte

Answer 1

Răspuns:

¹⁰⁰⁾x+15x/100=¹⁰⁰⁾345

100x+15x=34500

115x=34500

x=34500:115

x=300

¹⁰⁰⁾x-91x/100=¹⁰⁰⁾1872

100x-91x=187200

8x=197200

x=187200:8

x=23400

Answer 2

$\frac{x}{1} + \frac{15x}{100} = \frac{345}{1}$

$amplificam \: \frac{x}{1} \: si \: \frac{345}{1} \: cu \: 100$

$\frac{x}{100} + \frac{15x}{100} = \frac{345}{100}$

$100x + 15x = 34500$

$115 x = 34500$

$x = 34500 \div 115$

$x = 300$

$\frac{x}{1} - \frac{91 x}{100} = \frac{1872}{1}$

$amplificam \frac{x}{1} \: si \: \frac{1872}{1} \: cu \: 100$

$\frac{x}{100} - \frac{91x}{100} = \frac{1872}{100}$

$100x - 91x = 187200$

$9x = 187200$

$x = 187200 \div 9$

$x = 20800$