Question

the cost of a math book is five times the cost of a science book if a man purchased 5 science book and 3 math book and pay 300 rupees to the sab keypad find the cost of math and math book​

Answer 1

Answer:

the answer is 37 .5 rupees and if i m correct then please Follow Me i will follow u and please give me brilliant

Answer 2

$\sf{Let~the~cost~of~math~book~be~x}$

$\sf{Let~the~cost~of~science~book~be~y}$

$\bold{x=5y}$

$\longrightarrow$ $\bold{x-5y=0-----(1)}$

$\longrightarrow$ $\bold{3x+5y=300---(2)}$

$\sf{Adding~eq.~(1)~and~(2)~we~get,}$

$\longrightarrow$ $\bold{4x=300}$

$\longrightarrow$ $\bold{x=}$$\frac{300}{4}$

$\longrightarrow$ $\large{\sf{\fbox{x=75}}}$

$\sf{Putting~the~value~of~eq.~we~get,}$

$\longrightarrow$ $\bold{75=5y}$

$\longrightarrow$ $\bold{y=}$$\frac{75}{5}$

$\longrightarrow$ $\bold{y=15}$

Hence, cost of Math book is ₹75,

Cost of Science book is ₹15