SCIENCE FACTS:
How scientists make slides of specimens...
1They stain the specimen so it shows up really clearly under the microscope.A stain is a special dye that colours certain chemicals and shows up certain parts of the tiny object the scientist is looking at. A commonly used stain is cochineal - made from ground beetles!
2Cut a thin slice of the object. That's so that the light can shine through it from below and you can see it clearly under the microscope. How thin? Well about one thousandth of a millimetre (one micrometre) will do. Scientists use a tool called a microtome to do the cutting - and i expect very mean scientists use it to cut cake.
3They place the specimen on a glass with a drop of water to stop it drying out and a thin piece of glass called a cover slip to protect it. Or if they want to store the specimen they might cover it in glycerine and gelatine and seal the edges og the cover slip with the gum arabic to stop it from drying or rotting.
Question 1
Shop A has 156 kg of rice. Shop B has 72 kg of rice. After both shops sold an equal amount of rice, the ratio of rice that shop A has to shop B is 4:1. Find the amount of rice sold by each shop. (3 marks)
Solution to Q1
Question 2 (revised)
There are some workers. They arranged chairs into short rows and long rows. There are 18 short rows and 7 long rows. Each long row has 16 more chairs than the short row. Half of the chairs are arranged into long rows while 3/7 of chairs are arranged in short rows. The rest of the remaining chairs are stacked in a corner. a. What fraction of the chairs are stacked in the corner?b. How many chairs are arranged in rows? (5 marks)
Solution to Q2
Question 4
Peter saved some $1 coins in the months of May and June. His mother gave him $0.50 for each $1 coin saved in the month of May. Including his mother's contribution, Peter saved a total of $195 in May and June. This was 30% more than his usual savings. How much did Peter save in June? (4 marks)
Solution to Q4
Question 5
Karen, Lena and May shared some stickers in the ratio of 3:1:4. After May gave 40% of her stickers to Karen and Lena, Karen had 90 more stickers than May and the number of Lena's stickers increased by 70%.a. What was the percentage increase for Karen?b. How many stickers did May have at first? (5 marks)
Solution to Q5
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