Question

3. The value old mame uepieciales every yud Dy
machine is 54000, what was its value last year?
4. An alloy contains 30% copper, 42% nickel and rest zinc. Find the mass o
alloy.
In a class. 60% of the total number of students are boys a
and rest zinc. Find the mass of zinc in 1 kg of
udents are boys and there are 14 girls. How​

Answer 1

Answer:

In △ABC AB=AC

⇒∠B=∠C (Angles opposite to equal sides are equal)

Now using angle sum property

∠A+∠B+∠C=180

∘

⇒80

∘

+∠C+∠C=180

∘

⇒2∠C=180

∘

−80

∘

⇒∠C=

2

100

∘

=50

∘

now ∠C+∠x=180

∘

(Angles made on straight line (AC) are supplementary)

⇒50

∘

+∠x=180

∘

⇒∠x=180

∘

−50

∘

=130

∘