MEDIUM
MYP:4-5
IMPORTANT
Earn 100

A box with no top has a height that is six times its length and a width that is 23 of its height. If the surface area is 576 cm2, find the dimensions of the box.

Important Questions on Problem-Solving

MEDIUM
MYP:4-5
IMPORTANT

When milk freezes, its volume increases by one-fifteenth. Find the fraction by which its volume will decrease when it melts back into a liquid state.

MEDIUM
MYP:4-5
IMPORTANT

It takes Nathan twice as long mow the lawn with the pushmower than with the electric mower. One day, he used the electric mower for 30 minutes. Then it broke down. He took 20 minutes the lawn with the pushmower finish mowing. Find how long it takes Nathan to mow the whole lawn using only the electric mower. 

MEDIUM
MYP:4-5
IMPORTANT

The surface area of a cube-shaped box without a top is 252 cm2. Find the volume of the box.

MEDIUM
MYP:4-5
IMPORTANT

Some of these problems have too much information and some do not have enough. For each problem, state which information is irrelevant, and write down which information is missing in order for you to solve it. Josip just bought a lightweight cylindrical water bottle where the radius of the bottle is half of its height.  When full, it weighs 450 grams and holds a volume of 770 cm3. Find the dimensions of the water bottle.

MEDIUM
MYP:4-5
IMPORTANT
Three times the reciprocal of a number equals nine times the reciprocal of 6. Find the number.
HARD
MYP:4-5
IMPORTANT
The denominator of a fraction is 1 less than twice the numerator. When 7 is added to both the numerator and denominator, the resulting fraction is equivalent to710. Find the original fraction.
HARD
MYP:4-5
IMPORTANT
x milligrams of a metal containing 45% nickel must be combined with 6 milligrams of pure nickel to form an alloy containing 78% nickel. Find the value of x.
MEDIUM
MYP:4-5
IMPORTANT
Two different fruit juices are mixed together. 7 liters of the first fruit juice contains 60% apple juice, and 5 liters of the second fruit juice contains 30% apple juice. Find the percentage of the new mix that is apple juice.