Question

A person wants rupees 5 and rupees 10 from bank. if he draws 50 notes of rs. 350. what is no. of 10 rupee note he has

Answer 1

$no. \: of \: 10 \: rs = x \\ no. \: of \: 5 \: rs = 50 - x \\ 10x + 5(50 - x) = 350 \\ 10x + 250 - 5x = 350 \\ 10x + - 5x = 350 - 250 \\ 5x = 100 \\ x = 100 \div 5 = 20 \\ \\ no. \: of \: 10 \: rs = x = 20$

Answer 2

No. of 10 rs. is x.
$10x + 5(50 - x) = 350 \\ 10x + 250 - 5x = 350 \\ 10x + - 5x = 350 - 250 \\ 5x = 100 \\ x = 100 \div 5 \\ \: \: \: \: = 20$then,
No. of 10 rs. is 20.