Question

1. A man whose income is 576 a year spends 432 a year. What percenta
2. If 70% of the students in a school are boys and the number
a year spends 432 a year. What percentage of his income does
the school?
chool are boys and the number of girls is 540, find the number of boys
3. An alloy consists of 13 parts of copper to 7 parts of zinc and 5 parts of
O parts of copper to 7 parts of zinc and 5 parts of nickel What is the percentage​

Answer 1

Answer:

(1) 75%

(3)copper =35.13,zinc=37.83,nickel =27.02

Step-by-step explanation:

(1)%=spend rs×100/total

432×100/576=75%

(3)cu=13

Zn=14

Ni=10

T=37

Cu =13×100/37=35.13%

Zn=14×100/37=37.83%

Ni=10×100/37=27.02%