which of the following represents the situation where siri bought 5 apple and 6 oranges and laxmi bought 2 apple and 15 oranges for same amount of total money
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Let the cost of 1 book =x
And the cost of 1 pen =y
⇒5x+7y=79
⇒7x+5y=77
Equation (1) × 7 : 35x+49y=79×7
Equation (2) × 5 : 35x+25y=77×5
Subtract two equations ;
⇒24y=168
⇒y=7
⇒x=6
Total cost of 1 book and 2 pens =x+2y=6+14=20
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Answer:
Step-by-step explanation:
Let the cost of 1 book =x
And the cost of 1 pen =y
⇒5x+7y=79
⇒7x+5y=77
Equation (1) × 7 : 35x+49y=79×7
Equation (2) × 5 : 35x+25y=77×5
Subtract two equations ;
⇒24y=168
⇒y=7
⇒x=6
Total cost of 1 book and 2 pens =x+2y=6+14=20
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