Question: It's Mother's day, so mothers get a 10% discount on the department store. Mothers who have 3 children or more can get an additional 4% off the discounted price. If Mrs. Brown has 4 children and wants to buy a pair of shoes that costs $125, how much will she pay?
Answer: Mrs. Brown has a $125 x 10 / 100 = $12.5 discount for her purchase. So, the remaining amount she needs to pay is $125 - $12.5 = $112.5. But Mrs. Brown can still avail of the 5% discount, so she has an additional discount of $112.5 x 4 / 100 = $4.5. Therefore, Mrs. brown will only pay $112.5 - $4.5 = $108. The answer is 108.
[Question]Kim loves to knit sweaters and can knit as many as 10 sweaters in a day if she gets the time. On a particular week, she knit 8 sweaters on Monday, 2 more sweaters on Tuesday than on Monday, 4 fewer sweaters on both Wednesday and Thursday than on Tuesday, and half the number of sweaters she had knit on Monday on Friday. Calculate the total number of sweaters she knit that week.
[Answer]If she knit 8 sweaters on Monday and 2 more on Tuesday, she knit 8 + 2 = 10 sweaters on Tuesday. The total number of sweaters she had knit on Monday and Tuesday is 10 + 8 = 18. On Wednesday, she knit four fewer sweaters than the number she knit on Tuesday, which totals 10 - 4 = 6 sweaters. By Wednesday, she had knit 18 + 6 = 24 sweaters. On Thursday, she knit the same number of sweaters she had knit on Thursday, giving a total of 24 + 6 = 30 sweaters. On Friday, she knit half the number of sweaters she had knit on Monday, which totals 1 / 2 * 8 = 4 sweaters on Friday. So far, she has knit 30 + 4 = 34 sweaters by Friday. The answer is 34.
Q: Reyna had 20 lamps with seven light bulbs in each lamp. If 1/4 of them have 2 burnt-out light bulbs each, how many light bulbs are working?
A: The total number of light bulbs in the 20 lamps is 20 * 7 = 140. If 1 / 4 of the 20 lamps have burnt - out light bulbs, there are 1 / 4 * 20 = 5 lamps with burn out light bulbs. Since each of the 5 lamps has 2 burnt - out light bulbs, the number of burn out light bulbs is 2 * 5 = 10. The number of working light bulbs is 140 - 10 = 130. The answer is 130.
Question: An animal shelter is having a pet adoption event where owners can adopt an animal for just the cost of the vet fees. Vet fees for dogs are $15, and vet fees for cats are $13. Eight families adopt dogs and three adopt cats. The vet donates a third of the fees they were paid for the adoption checkups back to the shelter. How many dollars did the vet donate?
Answer: The vet made 8 * 15 = $120 in dog vet fees. The vet made 3 * 13 = $39 in cat vet fees. The total vet fees were 120 + 39 = $159. The vet donated 1 / 3 of the fees, so they donated 159 / 3 = $53 back to the shelter. The answer is 53.
[Question]Mason is mixing up some salad dressing. He takes a bowl that holds 150 ml and fills it 2/3rds with oil and 1/3rd with vinegar. The oil weighs 5 g/ml and the vinegar weighs 4 g/ml. How many grams does the salad dressing weigh?
[Answer]First find how many ml of oil Mason adds by multiplying the volume of the bowl by the proportion filled with oil: 150 ml * 2 / 3 = 100 ml. Then repeat the process to find how many ml of vinegar he added: 150 ml * 1 / 3 = 50 ml. Now find the weight of the oil by multiplying the volume by the weight / volume ratio: 100 ml * 5 g / ml = 500 g. Do the same procedure with the weight and weight / volume ratio of the vinegar to find its weight: 50 ml * 4 g / ml = 200 g. Now add the weight of the oil and the vinegar to find the weight of the salad dressing: 500 g + 200 g = 700 g. The answer is 700.
[Question]A blacksmith has 400kg of iron to make horseshoes for neighbouring farms and stables. There are 2 farms nearby, each of which has 2 horses. There are 2 stables nearby which all have 5 horses each. While the blacksmith is crafting, a riding school reaches out and asks for as many horseshoes as possible for their own horses. The blacksmith promises to give them however many horseshoes he has left when he has finished his orders for the farms and stables. If each horseshoe needs 2kg of iron, how many horses will get new horseshoes at the riding school?
[Answer]
The blacksmith can create a total of 400kg iron / 2kg iron per horseshoe = 200 horseshoes. The farms need enough horseshoes for 2 farms * 2 horses each = 4 horses. The stables need enough horseshoes for 5 stables * 2 horses each = 10 horses. So in total, the farms and stables have 4 + 10 = 14 horses that need horseshoes. This is a total of 14 horses * 4 horseshoes per horse = 56 horseshoes. This means the blacksmith has 200 total horseshoes – 56 horseshoes for the stables and farms = 144 horseshoes left for the riding school. The riding school therefore will have enough horseshoes for 144 horseshoes / 4 horseshoes per horse = 36 horses. The answer is 36.