Question

Vinu collected some stamps. Rahul collected 30 more than Vinu. Shaan collected 20 less than Rahul. Shaan had 150 stamps.

How many stamps did Vinu collect?

Answer 1

Vindu collected 140 stamps

Answer 2

$\textsf {Let the variables for the people be V, R, and S respectively.}$

$\textsf {1) R = V + 30}$

$\textsf {2) S = R - 20}$

$\textsf {3) S = 150}$

$\textsf {Substitute the value of S in Equation 2 :}$

$\implies \mathsf {150 = R - 20}$

$\implies \textsf {R = 170}$

$\textsf {Substitute the value of R in Equation 1 : }$

$\implies \textsf {170 = V + 30}$

$\implies \mathsf {V = 140}$

$\textsf {Therefore, Vinu collected 140 stamps.}$