Question

Please solve Q 1. 2. 3. 4.

Answer 1

1 a,2a3c this is the wright answer

Answer 2

1):-

let the sides of the two cubes be A and B respectively,

then according to the question, we have

6A²/6B² = 49/64,

A²/B²=49/64,

then

A/B=7/8,

therefore

ratio of volumes=A³/B³,

=7³/8³,

=343/512,

2):-

let the edge of the new cube be A,

then according to the question, we have

6³+7³+8³=A³,

216+343+512=A³,

A³=1071,

then
A=√1071,

A=10.3 approximately,

3):-

since

1 m³ = 1000 ltr

then

4 m³ = 4000 ltr,

4):-

let the radius of the circle be 10A,

then

initial area=π(10A)² = 100π A²,

new radius =9A,

then

new area = π(9A)² = 81π A²,

then
change in area = 100π A² - 81π A²,

= 19π A²,

therefore

% change = change in area/initial area × 100,

= 19π A²/100π A² × 100%,

= 19%