Step-by-step explanation:
Let x be the monthly income of Betty.
Income from July to September (i.e. 3 months) = 3x.
Income from January to June (i.e. 6 months) = 6x.
Betty's income from January to June is 15000 more than her July to September income.
=> 6x - 3x = 15000
=> 3x = 15000
=> x = 15000/3 = 5000.
So Betty's monthly income = 5000.
Her total annual income = 12 * 5000 = 60,000.
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Step-by-step explanation:
Let x be the monthly income of Betty.
Income from July to September (i.e. 3 months) = 3x.
Income from January to June (i.e. 6 months) = 6x.
Betty's income from January to June is 15000 more than her July to September income.
=> 6x - 3x = 15000
=> 3x = 15000
=> x = 15000/3 = 5000.
So Betty's monthly income = 5000.
Her total annual income = 12 * 5000 = 60,000.
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