# Khan/khan-exercises

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 Arithmetic word problems 1
randRange( 10, 100 ) randRange( 1, TOTAL - 1 ) TOTAL - NUM1

Before the previous stop there plural('was', TOTAL) plural(TOTAL, 'person') riding on a train. plural(NUM2, 'person') ended up getting off at the stop.

How many people are riding the train now?

NUM1 people

The number riding the train now is the difference between the number who were riding and the number who got off at the previous stop.

The difference is TOTAL - NUM2 plural('person') on the train.

TOTAL - NUM2 = NUM1 plural('person', NUM1) plural('is', NUM1) on the train.

There plural('is', NUM1) plural(NUM1, 'person') riding on a train. At the previous stop, plural(NUM2, 'person') got off.

How many people were riding the train before the stop?

TOTAL people

The number riding the train before the stop is the sum of the number who are riding now and the number who got off at the previous stop.

The sum is NUM1 + NUM2 plural('person') on the train.

NUM1 + NUM2 = TOTAL plural('person') plural('is', TOTAL) on the train.

There plural('was', TOTAL) plural(TOTAL, 'person') riding on a train before it stopped and some number of people got off. Now there plural('is', NUM2) plural(NUM2, 'person') riding on the train.

How many people got off the train at the stop?

NUM1 people

The number of people who got off is the difference between the number who were riding before and the number who are riding now.

The difference is TOTAL - NUM2 plural('person').

TOTAL - NUM2 = NUM1 plural('person', NUM1) got off.

There plural('is', NUM1) plural(NUM1, 'tree') on the right bank of a river and plural(NUM2, 'tree') on the left bank.

How many trees are on the banks of the river?

TOTAL trees

The total number of trees on the two banks of the river is the sum of the number of trees on the left bank and the number of trees on the right bank.

The sum is NUM1 + NUM2 plural('tree').

NUM1 + NUM2 = TOTAL plural('tree').

There plural('is', TOTAL) plural(TOTAL, 'tree') on the banks of the river. The side(1) bank has NUM2 of them.

How many trees are on the side(2) bank of the river?

NUM1 trees

The number of trees on the side(2) bank of the river is the difference between the number of trees on both banks of the river and the number of trees on the side(1) bank.

The difference is TOTAL - NUM2 plural('tree').

TOTAL - NUM2 = NUM1 plural('tree', NUM1).

Some cars were parked in the store(1) store parking lot. NUM2 more plural('car') plural('parks', 'park', NUM2) at the store(1) store, and now there plural('is', TOTAL) plural(TOTAL, 'car') in the parking lot.

How many cars were parked at the store(1) store at the beginning?

NUM1 cars

The number of cars parked at the store at the beginning is the difference of the number parked now and the number that came and parked earlier.

The difference is TOTAL - NUM2 plural('car').

TOTAL - NUM2 = NUM1 plural('car', NUM1).

Initially there plural( 'was', NUM2 ) plural( NUM2, 'car' ) parked in the store(1) store parking lot. During the following randRange( 2, 3 ) hours some more cars parked at the store(1) store, and now there plural('is', TOTAL) plural(TOTAL, 'car') in the parking lot. No cars left the parking lot during this time.

How many cars parked in the store( 1 ) store parking lot after the initial plural( NUM2, 'car' )?

NUM1 cars

The number of cars that came and parked at the store is the difference between the number that were parked earlier and the number that are parked now.

The difference is TOTAL - NUM2 plural('car').

TOTAL - NUM2 = NUM1 plural('car', NUM1).

plural(NUM1, 'car') plural('was', NUM1) in the store(1) store parking lot. NUM2 more plural('car', NUM2) plural('parks', 'park', NUM2) at the store(1) store.

How many cars are in the parking lot now?

TOTAL cars

The number of cars that are parked now is the sum of the number that were parked earlier and the number that came to park.

The sum is NUM1 + NUM2 plural('car').

NUM1 + NUM2 = TOTAL plural('car').

person(1) did plural(TOTAL, exercise(1)) timeofday(1). person(2) did plural(NUM2, exercise(1)) timeofday(2).

How many more plural(exercise(1)) did person(1) do than person(2)?

NUM1 plural(exercise(1))

Find the difference between person(1)'s plural(exercise(1)) and person(2)'s plural(exercise(1)).

The difference is TOTAL - NUM2.

TOTAL - NUM2 = NUM1.

How many fewer plural(exercise(1)) did person(2) do than person(1)?

person(1) did NUM1 more plural(exercise(1), NUM1) than person(2) timeofday(1). person(2) did plural(NUM2, exercise(1)).

How many plural(exercise(1)) did person(1) do?

TOTAL plural(exercise(1))

person(2) did plural(NUM2, exercise(1)), and person(1) did NUM1 more than that, so find the sum.

The sum is NUM2 + NUM1 plural(exercise(1)).

He(1) did NUM2 + NUM1 = TOTAL plural(exercise(1)).

person(2) did NUM1 fewer plural(exercise(1), NUM1) than person(1) timeofday(1). person(2) did plural(NUM2, exercise(1)).

person(1) did NUM1 more plural(exercise(1), NUM1) than person(2) timeofday(1). person(1) did plural(TOTAL, exercise(1)).

How many plural(exercise(1)) did person(2) do?

NUM2 plural(exercise(1))

person(1) did plural(TOTAL, exercise(1)), and person(2) did NUM1 fewer than that, so find the difference.

The difference is TOTAL - NUM1 plural(exercise(1)).

He(1) did TOTAL - NUM1 = NUM2 plural(exercise(1), NUM2).

person(2) did NUM1 fewer plural(exercise(1), NUM1) than person(1) timeofday(1). person(1) did plural(TOTAL, exercise(1)).

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