Question

Three books and two biros weigh 430g. One book and four biros of the same mass weigh 210g find the weight of a book and a biro

Answer 1

Answer:

Weight of book = 130gm

Weight of Biro = 20gm

Step-by-step explanation:

let weight of book be X

let weight of biro be Y

A To Q

3X + 2Y = 430

X + 4Y = 210

6X + 4Y = 860

-X + (-)4Y = -210

5X = 650

X = 130

130 + 4Y = 210

4Y = 210 - 130

Y = 20