Question

In an envelope there are some 5 rupee notes and some 10 rupee notes. Total amount of these notes together is 350 rupees. Number of 5 rupee notes are less by 10 than number of 10 rupee notes. Then find the number of 5 rupee and 10 rupee notes​

Answer 1

Let the number of 10 rupee note be x

number of 5 rupee note=2x-10

Total amount= 350rupees

therefore the equation for total rupee=

10x+10x-50=350

20x-50=350

20x=400

x=400÷20

x=20

10rupee notes are20

5rupee notes are 30