Question

The cost of $35$ envelopes is $₹105$. How many envelopes can be bought for $₹90$?​

Answer 1

Given Cost of 35 envelopes $=₹105$.
$\Rightarrow$ Number of envelopes brought for $₹105=35$.
$\Rightarrow$ Number of envelopes brought for $₹1=\frac{35}{105}$.
$\Rightarrow$ Number of envelopes bought for $₹90$.
$=\frac{35}{105}\times 90$
$=\frac{7\times 5}{7\times 3\times 5}\times 90$
$=30$
$\therefore$ Number of envelopes bought for $₹90=30$
Hence, $30$ envelopes can be bought for $₹90$.