3. Somya earns 12a + 7b rupees every month. She spends 2a – 3b rupees. How many rupees does she save?
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money earned by somya=12a+7b
money spent by somya=2a-3b
money saved by somya=12a+7b-(2a-3b)
=12a+7b-2a+3b
=10a+10b
Answered by
1
Answer:
Given:
Earning of somya = 12a + 7b
she spend = 2a - 3b
To find:
her saving
solution:
saving = Earning - she spend
= 12a + 7b - ( 2a - 3b )
= 12a + 7b - 2a + 3b
= 12a - 2a + 7b + 3b
= 10a + 10b
or 10( a + b)
hence, saving is 10 ( a + b)
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