Question

A sum of 1270 rupees in the of denominations 10rupees and 20 rupees. If the total number of notes are 81 find the number of notes of each domination

Answer 1

OK then

let's start

for instance realise that Manoj has 1270 rupees and he had keep this rupees in his bag and we know that there are notes of 10 and 20 in his bag and in counting there are 81 notes in bag so we have to find that number of notes of 20 and 10 in his bag .

So let's find -----:--

first we have to check that rupees 1270 is divisible by 20 or not

after dividing we know that 20 is not divisible by 1270 but it is divisible by 1260 if we multiply 20 bye 63 but 10 rupees remain left there are notes of 10 also in the Manoj then there are 1 note of 10

after checking we find that if Manoj has 63 notes of 20 then he had 1 note of 10

prove

$63 \times 20 + 10 \times 1 \\ = 1260 + 10 \\ = 1270$

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