Question

A pencil box and 7 similar pens cost rs.39.The pencil box costs rs. 15 more than a pen then find the cost of the pencil box.​

Answer 1

Answer:

rs.18

Step-by-step explanation:

Let the pen be p and the pencil box be 15 + p

hence, 15 + p + 7p = 39

Collect like terms

p + 7p = 39 - 15

8p = 24

Divide both sides by 8

p = 3, a pen costs rs. 3

A pencil box costs rs. 15 + p(rs.3) = rs.18