Advertisements
Advertisements
Question
Evaluate:
8% of 900 – 12% of 750 + 20% of 165.
Advertisements
Solution
8% of 900 – 12% of 750 + 20% of 165
= `(8xx900)/100-(12xx750)/100+(20xx165)/100`
= 72 − 90 + 33
= 72 + 33 − 90
= 105 − 90
= 15
APPEARS IN
RELATED QUESTIONS
Asha got 86.875% marks in the annual examination. If she got 695 marks, find the total number of marks of the examination.
A garden has 2000 trees. 12% of these are mango trees, 18% lemon and the rest are orange trees. Find the number of orange trees.
Gunpowder contains 75% nitre and 10% sulphur. Find the amount of the gunpowder which carries 9 kg nitre. What amount of gunpowder would contain 2.3 kg sulphur?
An alloy of tin and copper consists of 15 parts of tin and 105 parts of copper. Find the percentage of copper in the alloy?
Express the following percentage as a fraction and as a decimal number:
175 %
A number is increased by 25% and then decreased by 20%. Find the percentage change in that number
Lalitha took a math test and got 35 correct and 10 incorrect answers. What was the percentage of correct answers?
A tank can hold 200 litres of water. At present, it is only 40% full. How many litres of water to fill in the tank, so that it is 75% full?
Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. For example, if you apply sunscreen with SPF 15, you get 1 minute of UV rays for every 15 minutes you stay in the sun.
A sunscreen with SPF 15 allows only `1/15` of the sun’s UV rays. What per cent of UV rays does the sunscreen abort?
In a class of 50 students, 8 % were absent on one day. The number of students present on that day was ______.
