Math practice for 13 year olds - page 23 of 422

Number of problems found: 8426

Three members
If 2a+2+a =17, what is the value of a?
Children
Of the estimated 2 billion children living in the developing world, approximately 400 million do not have access to safe drinking water. Approximately what percentage of children in developing countries do not have safe water to drink?
A bank
A bank reported that x/12 more first-time buyers took a mortgage out last month. If a quarter more mortgages were taken out, what number (x) is missing?
The ratio 16
Express the following ratio in simplest form: 90:100
A miner
A miner is working at an elevation of -64 7/9 and then ascends 22 1/3. What is the miner's new location?
Evaluate 40
Evaluate a+bc-d if a=78, b=-716, c=0.8, and d=14 . Write your answer as a fraction in simplest form.
Ramit
Ramit bought 10 pens,8 pencils, and 4 books; pens were Rs.5 1/2 each, pencils were Rs.2 1/2 each and books were Rs. 11 1/2 each; how much did they cost together?
Usain
Usain and Kyle rented a house together for 3 years. Usain paid more rent because he had a bigger room. They always split the rent at a ratio of 4:3. They paid £30247 in rent over this period. How much of this did Usain pay?
Estimate and exact
A) estimate 0.34 x 0.063 by rounding both numbers to one significant figure b) work out the exact value of 0.34 x 0.063 compare answers to parts a) and b)
Sqrt of sum
Find one-third of the square root of 81, the sum of 12, and the product of 3 and 12.
Linda
Linda gave her sister 2/5 of her money, spent 1/3, and saved the remainder. If Linda saved $28.00, how much money did she have at first?
Dostaneli
If we get 5% of the amount that Petr has in his wallet and 4% of the amount that Paul has with him, we will have 46 CZK. However, if we get 4% from Peter's and 5% from Paul's, we will only have 44 CZK. How many crowns do Petr and Paul have with them?
Twice squared
If the square of twice a number is 81, what is the number? Give a positive number x.
There 35
There are three points on a straight line: A, BC. If CD = 8x, DE = 3, and CE = x + 10, what is CD? Simplify your answer and write it as a proper fraction, mixed number, or integer.
Can you
Can you help me solve this math problem? I need to know the answer after multiplying 2 2/3 by 2 1/4 and then adding 1 2/3 divided by 1 4/5. Thank you in advance for your assistance.
Comparing by height
Ira is 1 2/5 m tall. Her mother is 4/5 m as tall as Ira. How many times is Ira's mother taller than her?
Bookshelf 3
How many 1/35-inch thick books can fit on a 1 4/12-inch long bookshelf?
The painter
Alex had 5/6 liter of white paint. He used 1/8 of it to paint the walls and 2/5 of the remaining to paint the fence. How much paint is left?
Solution mg/ml
If 70 ml of solution contains 280mg of drug, how many milligrams of drugs are in 50 ml of solution?
Fresh chickens
In the market, one stall is selling fresh chickens worth P120 per kilo. A person bought two fresh chickens weighing 1 1/2 and 1 1/4 kilos each. What is the total weight of the two chickens?

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